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<p>to the development of expert systems and inference engines, artificial intelligence researchers focused on more powerful <a href="page.php?w=Theorem-prover">theorem prover</a> environments that offered much fuller implementations of <a href="page.php?w=first-order_logic">first-order logic</a>. For example, general statements that included <a href="page.php?w=universal_quantification">universal quantification</a> (for all X some statement is true) and <a href="page.php?w=existential_quantification">existential quantification</a> (there exists</p><p>
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