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<a accesskey="3" href="page.php?w=Description_logic&amp;p=2">3.Next</a>
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<p><b>Description logics</b> (<b>DL</b>) are a family of formal <a href="page.php?w=knowledge_representation">knowledge representation</a> languages. Many DLs are more expressive than <a href="page.php?w=propositional_logic">propositional logic</a> but less expressive than <a href="page.php?w=first-order_logic">first-order logic</a>. In contrast to the latter, the core reasoning problems for DLs are (usually) <a href="page.php?w=Decidability_%28logic%29">decidable</a>, and efficient decision procedures have been designed and implemented for these</p><p>
<a accesskey="3" href="page.php?w=Description_logic&amp;p=2">3.Next</a>
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