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<a accesskey="3" href="page.php?w=closed-world_assumption&amp;p=2">3.Next</a>
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<p>The <b>closed-world assumption</b> (<b>CWA</b>), in a <a href="page.php?w=Mathematical_logic">formal system of logic</a> used for <a href="page.php?w=knowledge_representation">knowledge representation</a>, is the presumption that a statement that is true is also known to be true. Therefore, by the <a href="page.php?w=contrapositive">contrapositive</a>, what is not currently known to be true must be false. The same name also refers to a <a href="page.php?w=formal_logic">logical</a> formalization of this assumption by <a href="page.php?w=Raymond_Reiter">Raymond Reiter</a>.</p><p>
<a accesskey="3" href="page.php?w=closed-world_assumption&amp;p=2">3.Next</a>
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