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<!--Weave of 'Implications' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#9">Chapter 9: The A-Parser</a></li><li><b>Implications</b></li></ul></div>
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<p class="purpose">To keep track of a dangerous form of super-assertion called an implication, which is allowed to generalise about properties.</p>
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<ul class="toc"><li><a href="9-imp.html#SP1">§1. Definitions</a></li><li><a href="9-imp.html#SP5">§5. Implication checking</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1"></a><b>§1. Definitions. </b></p>
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<p class="commentary firstcommentary"><a id="SP2"></a><b>§2. </b>Implications are structures are used to store the information in sentences
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like "Something worn is usually wearable and initially carried." The
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"something worn" part must turn out to be a description of a category of
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objects; the "usually" part translates into a level of certainty. We regard
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these as implications in the sense of IF condition A, THEN condition B, but
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note that A is quite restricted in what it can be: it must be a simple-to-test
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description only, whereas B could be any subtree of an assertion.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">implication</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">if_spec</span><span class="plain-syntax">; </span><span class="comment-syntax"> which objects are affected</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">then_pn</span><span class="plain-syntax">; </span><span class="comment-syntax"> what assertion is implied about them</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">implied_likelihood</span><span class="plain-syntax">; </span><span class="comment-syntax"> with what certainty level</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">implication</span><span class="plain-syntax"> *</span><span class="identifier-syntax">next_implication</span><span class="plain-syntax">; </span><span class="comment-syntax"> in list of implications</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">implication</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure implication is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3"></a><b>§3. </b>We also need a little piece of storage attached to each property name:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">possession_marker</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">possessed</span><span class="plain-syntax">; </span><span class="comment-syntax"> temporary use when checking implications about objects</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">possession_certainty</span><span class="plain-syntax">; </span><span class="comment-syntax"> ditto</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">possession_marker</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure possession_marker is accessed in 12/ap and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4"></a><b>§4. </b>Implications are gathered during the main parse tree traverses, but all we do
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is to store them and sit on them.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Assertions::Implications::new</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Assertions::Implications::new</span></span>:<br/>Make Assertions - <a href="9-ma.html#SP3_3_2">§3.3.2</a>, <a href="9-ma.html#SP3_3_22">§3.3.22</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">py</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">prevailing_mood</span><span class="plain-syntax"> == </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Reject implications given with certainty</span><span class="named-paragraph-number">4.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">) == </span><span class="identifier-syntax">AND_NT</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="9-imp.html#SP4" class="function-link"><span class="function-syntax">Assertions::Implications::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="9-imp.html#SP4" class="function-link"><span class="function-syntax">Assertions::Implications::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">px</span><span class="plain-syntax">, </span><span class="identifier-syntax">py</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">-></span><span class="element-syntax">next</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Actually create a single implication</span><span class="named-paragraph-number">4.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4_1"></a><b>§4.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Reject implications given with certainty</span><span class="named-paragraph-number">4.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_ImplicationCertain</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that's an implication which is too certain for me"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"since a sentence like this talks about a generality of things in terms of "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"one either/or property implying another, and I can only handle those as "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"likelihoods. You should probably add 'usually' somewhere: e.g., 'An open "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"door is usually openable'. (But implications can have unpredictable "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"consequences: best to avoid them altogether where possible.)"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP4">§4</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4_2"></a><b>§4.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Actually create a single implication</span><span class="named-paragraph-number">4.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">premiss</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP4_2_1" class="named-paragraph-link"><span class="named-paragraph">Find the premiss kind and specification</span><span class="named-paragraph-number">4.2.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP4_2_2" class="named-paragraph-link"><span class="named-paragraph">Check that the premiss involves only either/or properties and/or a kind</span><span class="named-paragraph-number">4.2.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP4_2_3" class="named-paragraph-link"><span class="named-paragraph">Check that the conclusion involves only a single either/or property</span><span class="named-paragraph-number">4.2.3</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">implication</span><span class="plain-syntax"> *</span><span class="identifier-syntax">imp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">implication</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">if_spec</span><span class="plain-syntax"> = </span><span class="identifier-syntax">premiss</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">then_pn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">py</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">implied_likelihood</span><span class="plain-syntax"> = </span><span class="identifier-syntax">prevailing_mood</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">next_implication</span><span class="plain-syntax"> = </span><a href="16-is.html#SP16" class="function-link"><span class="function-syntax">InferenceSubjects::get_implications</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="16-is.html#SP16" class="function-link"><span class="function-syntax">InferenceSubjects::set_implications</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">imp</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"Forming implication for $j: $D implies\n $T"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">if_spec</span><span class="plain-syntax">, </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">then_pn</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP4">§4</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4_2_1"></a><b>§4.2.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Find the premiss kind and specification</span><span class="named-paragraph-number">4.2.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">loc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">px</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">loc</span><span class="plain-syntax">) == </span><span class="identifier-syntax">WITH_NT</span><span class="plain-syntax">) </span><span class="identifier-syntax">loc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">loc</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_subject</span><span class="plain-syntax">(</span><span class="identifier-syntax">loc</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">premiss</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_creation_proposition</span><span class="plain-syntax">(</span><span class="identifier-syntax">loc</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax"> = </span><a href="13-kak.html#SP1" class="function-link"><span class="function-syntax">Kinds::Knowledge::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_thing</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">IF_MODULE</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">premiss_kind</span><span class="plain-syntax"> = </span><a href="13-kak.html#SP1" class="function-link"><span class="function-syntax">Kinds::Knowledge::as_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_object</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP4_2">§4.2</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4_2_2"></a><b>§4.2.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Check that the premiss involves only either/or properties and/or a kind</span><span class="named-paragraph-number">4.2.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="12-ap.html#SP13" class="function-link"><span class="function-syntax">Calculus::Propositions::Assert::testable_at_compile_time</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">premiss</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_BadImplicationDomain</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"that's an implication where the condition to qualify is not "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"one that I can determine in advance of the start of play"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"since it involves more than simple either/or properties "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"plus a kind. (For example, adjectives like 'adjacent' or "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"'visible' here are too difficult to determine.)"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP4_2">§4.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2_3"></a><b>§4.2.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Check that the conclusion involves only a single either/or property</span><span class="named-paragraph-number">4.2.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><a href="4-am.html#SP13" class="function-link"><span class="function-syntax">Adjectives::Meanings::has_EORP_meaning</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_aph</span><span class="plain-syntax">(</span><span class="identifier-syntax">py</span><span class="plain-syntax">), </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP5" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_ImplicationValueProperty</span><span class="plain-syntax">),</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"that's an implication where the outcome is an adjective other than "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"a simple either/or property"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"which is the only form of implication I can handle."</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP4_2">§4.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5"></a><b>§5. Implication checking. </b>The checking of implications happens all at once, during model completion,
|
|
so that all inferences arising directly from the source text have already
|
|
been drawn.
|
|
</p>
|
|
|
|
<p class="commentary">For instance, if there is an inference asserting that object X is worn, and
|
|
there is an implication that what is worn is usually also wearable, then we
|
|
must generate an inference that X is wearable: in effect, this is a deduction
|
|
from a syllogism. We should however not generate such an inference if we
|
|
already have definite knowledge that X is not wearable. We do this for each
|
|
object X individually.
|
|
</p>
|
|
|
|
<p class="commentary">We begin by checking implications associated with X and applying to X,
|
|
but in fact because <span class="extract"><span class="extract-syntax">Assertions::Implications::check_implications_of</span></span> recurses depth-first through
|
|
the kinds, a typical object X — a container, say — will first have
|
|
implications associated with "thing" applied to it, then with
|
|
those associated with "container", and only then its own implications.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Assertions::Implications::consider_all</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">Assertions::Implications::consider_all</span></span>:<br/>Complete Model World - <a href="16-cmw.html#SP1_1">§1.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="16-is.html#SP21" class="function-link"><span class="function-syntax">InferenceSubjects::domain</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ongoing</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ongoing</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">Erase all of the possession markers</span><span class="named-paragraph-number">5.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="9-imp.html#SP6" class="function-link"><span class="function-syntax">Assertions::Implications::set_possessed_flags</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">ongoing</span><span class="plain-syntax"> = </span><a href="9-imp.html#SP7" class="function-link"><span class="function-syntax">Assertions::Implications::check_implications_of</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5_1"></a><b>§5.1. </b>We are going to need to examine which either/or properties are held by X.
|
|
We don't want to store all of the properties of everything in memory at once,
|
|
so we keep just a single set of "possession markers", one for each property.
|
|
Here we erase these markers ready for use with X.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Erase all of the possession markers</span><span class="named-paragraph-number">5.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><span class="reserved-syntax">property</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">possession_marker</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pom</span><span class="plain-syntax"> = </span><a href="15-pr.html#SP24" class="function-link"><span class="function-syntax">Properties::get_possession_marker</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possessed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possession_certainty</span><span class="plain-syntax"> = </span><span class="identifier-syntax">UNKNOWN_CE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6"></a><b>§6. </b>This is the recursive routine which sets the possession markers for X on the
|
|
basis of the inferences so far drawn about it.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Assertions::Implications::set_possessed_flags</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">Assertions::Implications::set_possessed_flags</span></span>:<br/><a href="9-imp.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">k</span><span class="plain-syntax"> = </span><a href="16-is.html#SP14" class="function-link"><span class="function-syntax">InferenceSubjects::narrowest_broader_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">k</span><span class="plain-syntax">) </span><a href="9-imp.html#SP6" class="function-link"><span class="function-syntax">Assertions::Implications::set_possessed_flags</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">k</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inf</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">KNOWLEDGE_LOOP</span><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs</span><span class="plain-syntax">, </span><span class="constant-syntax">PROPERTY_INF</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><a href="16-in.html#SP11" class="function-link"><span class="function-syntax">World::Inferences::get_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="15-pr.html#SP16" class="function-link"><span class="function-syntax">Properties::is_either_or</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)) && (</span><a href="16-in.html#SP11" class="function-link"><span class="function-syntax">World::Inferences::get_certainty</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">) != </span><span class="identifier-syntax">UNKNOWN_CE</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">See what we can get out of this inference</span><span class="named-paragraph-number">6.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6_1"></a><b>§6.1. </b>Note that where there are antonyms such as open/closed, we have to mark
|
|
both of them, because an inference of being closed is as good as an inference
|
|
of not being open, and vice versa.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">See what we can get out of this inference</span><span class="named-paragraph-number">6.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">truth_state</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="identifier-syntax">certainty</span><span class="plain-syntax"> = </span><a href="16-in.html#SP11" class="function-link"><span class="function-syntax">World::Inferences::get_certainty</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inf</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">certainty</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="identifier-syntax">certainty</span><span class="plain-syntax"> = -</span><span class="identifier-syntax">certainty</span><span class="plain-syntax">; </span><span class="identifier-syntax">truth_state</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">possession_marker</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pom</span><span class="plain-syntax"> = </span><a href="15-pr.html#SP24" class="function-link"><span class="function-syntax">Properties::get_possession_marker</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP6_1_1" class="named-paragraph-link"><span class="named-paragraph">Mark this property if its possession is not already equally certainly known</span><span class="named-paragraph-number">6.1.1</span></a></span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="15-ep.html#SP6" class="function-link"><span class="function-syntax">Properties::EitherOr::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><a href="15-ep.html#SP6" class="function-link"><span class="function-syntax">Properties::EitherOr::get_negation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pom</span><span class="plain-syntax"> = </span><a href="15-pr.html#SP24" class="function-link"><span class="function-syntax">Properties::get_possession_marker</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prn</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">truth_state</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">truth_state</span><span class="plain-syntax">)?</span><span class="identifier-syntax">FALSE:TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP6_1_1" class="named-paragraph-link"><span class="named-paragraph">Mark this property if its possession is not already equally certainly known</span><span class="named-paragraph-number">6.1.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP6">§6</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6_1_1"></a><b>§6.1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Mark this property if its possession is not already equally certainly known</span><span class="named-paragraph-number">6.1.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possession_certainty</span><span class="plain-syntax"> < </span><span class="identifier-syntax">certainty</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possessed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">truth_state</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possession_certainty</span><span class="plain-syntax"> = </span><span class="identifier-syntax">certainty</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP6_1">§6.1</a> (twice).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7"></a><b>§7. </b>Lastly, then, the routine actually checking and applying implications.
|
|
Our aim is to find and act upon the first implication which makes a difference,
|
|
and return <span class="extract"><span class="extract-syntax">TRUE</span></span>; but if no implication can be acted on, to return <span class="extract"><span class="extract-syntax">FALSE</span></span>.
|
|
</p>
|
|
|
|
<p class="commentary">This cannot act twice on the same candidate with the same implication, since
|
|
the act results in creating inferences about the property. An attempt at
|
|
repetition results in redundancy, since the inferences it would make have
|
|
no better a certainty level.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Assertions::Implications::check_implications_of</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">Assertions::Implications::check_implications_of</span></span>:<br/><a href="9-imp.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">domain</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">candidate</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">k</span><span class="plain-syntax"> = </span><a href="16-is.html#SP14" class="function-link"><span class="function-syntax">InferenceSubjects::narrowest_broader_subject</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">domain</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">k</span><span class="plain-syntax">) && (</span><a href="9-imp.html#SP7" class="function-link"><span class="function-syntax">Assertions::Implications::check_implications_of</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">k</span><span class="plain-syntax">, </span><span class="identifier-syntax">candidate</span><span class="plain-syntax">))) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="16-is.html#SP16" class="function-link"><span class="function-syntax">InferenceSubjects::get_implications</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">domain</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"Considering implications about $j as they apply to $j:\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">domain</span><span class="plain-syntax">, </span><span class="identifier-syntax">candidate</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">implication</span><span class="plain-syntax"> *</span><span class="identifier-syntax">imp</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">imp</span><span class="plain-syntax"> = </span><a href="16-is.html#SP16" class="function-link"><span class="function-syntax">InferenceSubjects::get_implications</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">domain</span><span class="plain-syntax">); </span><span class="identifier-syntax">imp</span><span class="plain-syntax">; </span><span class="identifier-syntax">imp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">next_implication</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP7_1" class="named-paragraph-link"><span class="named-paragraph">Consider this individual implication as it applies to the candidate</span><span class="named-paragraph-number">7.1</span></a></span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP7_1"></a><b>§7.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Consider this individual implication as it applies to the candidate</span><span class="named-paragraph-number">7.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">conclusion_state</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Annotations::read_int</span><span class="plain-syntax">(</span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">then_pn</span><span class="plain-syntax">, </span><span class="constant-syntax">negated_boolean_ANNOT</span><span class="plain-syntax">)) </span><span class="identifier-syntax">conclusion_state</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">implied_likelihood</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">conclusion_state</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">conclusion_state</span><span class="plain-syntax">)?</span><span class="identifier-syntax">FALSE:TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"$D => $T (certainty %d; changed state %d)\n"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">if_spec</span><span class="plain-syntax">, </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">then_pn</span><span class="plain-syntax">, </span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">implied_likelihood</span><span class="plain-syntax">, </span><span class="identifier-syntax">conclusion_state</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">conclusion_prop</span><span class="plain-syntax"> = </span><a href="4-am.html#SP13" class="function-link"><span class="function-syntax">Adjectives::Meanings::has_EORP_meaning</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_aph</span><span class="plain-syntax">(</span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">then_pn</span><span class="plain-syntax">), </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP7_1_1" class="named-paragraph-link"><span class="named-paragraph">Check that the conclusion is not impossible</span><span class="named-paragraph-number">7.1.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">possession_marker</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pom</span><span class="plain-syntax"> = </span><a href="15-pr.html#SP24" class="function-link"><span class="function-syntax">Properties::get_possession_marker</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">conclusion_prop</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP7_1_2" class="named-paragraph-link"><span class="named-paragraph">Check that the conclusion is not redundant or irrelevant</span><span class="named-paragraph-number">7.1.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">candidate_qualifies</span><span class="plain-syntax"> = </span><a href="12-ap.html#SP14" class="function-link"><span class="function-syntax">Calculus::Propositions::Assert::test_at_compile_time</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">imp</span><span class="plain-syntax">-></span><span class="element-syntax">if_spec</span><span class="plain-syntax">, </span><span class="identifier-syntax">candidate</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">candidate_qualifies</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"PASS: changing property $Y of $j\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">conclusion_prop</span><span class="plain-syntax">, </span><span class="identifier-syntax">candidate</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="9-imp.html#SP7_1_3" class="named-paragraph-link"><span class="named-paragraph">Apply the conclusion to the candidate</span><span class="named-paragraph-number">7.1.3</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"FAIL: take no action\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP7">§7</a>.</li></ul>
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|
<p class="commentary firstcommentary"><a id="SP7_1_1"></a><b>§7.1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Check that the conclusion is not impossible</span><span class="named-paragraph-number">7.1.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">conclusion_prop</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) ||</span>
|
|
<span class="plain-syntax"> (</span><a href="16-pp.html#SP8" class="function-link"><span class="function-syntax">World::Permissions::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">candidate</span><span class="plain-syntax">, </span><span class="identifier-syntax">conclusion_prop</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"IMPOSSIBLE: property not provided\n"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">continue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP7_1">§7.1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7_1_2"></a><b>§7.1.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Check that the conclusion is not redundant or irrelevant</span><span class="named-paragraph-number">7.1.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"Possession marker has (certainty %d; possessed state %d)\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possession_certainty</span><span class="plain-syntax">, </span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possessed</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possessed</span><span class="plain-syntax"> == </span><span class="identifier-syntax">conclusion_state</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"REDUNDANT: property already correct\n"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">continue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pom</span><span class="plain-syntax">-></span><span class="element-syntax">possession_certainty</span><span class="plain-syntax"> == </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">IMPLICATIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"IRRELEVANT: property already settled\n"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">continue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP7_1">§7.1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7_1_3"></a><b>§7.1.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Apply the conclusion to the candidate</span><span class="named-paragraph-number">7.1.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">adjective</span><span class="plain-syntax"> *</span><span class="identifier-syntax">aph</span><span class="plain-syntax"> = </span><a href="15-ep.html#SP8" class="function-link"><span class="function-syntax">Properties::EitherOr::get_aph</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">conclusion_prop</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">pcalc_prop</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop</span><span class="plain-syntax"> = </span><a href="11-ap.html#SP18" class="function-link"><span class="function-syntax">Calculus::Atoms::KIND_new</span></a><span class="plain-syntax">(</span><a href="16-is.html#SP21" class="function-link"><span class="function-syntax">InferenceSubjects::domain</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">domain</span><span class="plain-syntax">), </span><a href="11-tr.html#SP4" class="function-link"><span class="function-syntax">Calculus::Terms::new_variable</span></a><span class="plain-syntax">(0));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">conclusion_state</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">prop</span><span class="plain-syntax"> = </span><a href="11-pr.html#SP15" class="function-link"><span class="function-syntax">Calculus::Propositions::concatenate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><a href="11-ap.html#SP7" class="function-link"><span class="function-syntax">Calculus::Atoms::new</span></a><span class="plain-syntax">(</span><span class="constant-syntax">NEGATION_OPEN_ATOM</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">prop</span><span class="plain-syntax"> = </span><a href="11-pr.html#SP15" class="function-link"><span class="function-syntax">Calculus::Propositions::concatenate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><a href="11-ap.html#SP20" class="function-link"><span class="function-syntax">Calculus::Atoms::unary_PREDICATE_from_aph</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">aph</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">prop</span><span class="plain-syntax"> = </span><a href="11-pr.html#SP15" class="function-link"><span class="function-syntax">Calculus::Propositions::concatenate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><a href="11-ap.html#SP7" class="function-link"><span class="function-syntax">Calculus::Atoms::new</span></a><span class="plain-syntax">(</span><span class="constant-syntax">NEGATION_CLOSE_ATOM</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">prop</span><span class="plain-syntax"> = </span><a href="11-pr.html#SP15" class="function-link"><span class="function-syntax">Calculus::Propositions::concatenate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><a href="11-ap.html#SP20" class="function-link"><span class="function-syntax">Calculus::Atoms::unary_PREDICATE_from_aph</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">aph</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><a href="12-ap.html#SP5" class="function-link"><span class="function-syntax">Calculus::Propositions::Assert::assert_true_about</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop</span><span class="plain-syntax">, </span><span class="identifier-syntax">candidate</span><span class="plain-syntax">, </span><span class="identifier-syntax">CERTAIN_CE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="9-imp.html#SP7_1">§7.1</a>.</li></ul>
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