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Predicate Logic

Predicate Logic

Predicate Logic

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Existential quantification<br />

∃ <br />

Someone at NUS is smart:<br />

∃x At(x,NUS) ∧ Smart(x )$<br />

∃x P is true in a model m iff P is true with x being some possible object<br />

in the model<br />

Roughly speaking, equivalent to the disjunction of instantiations of P<br />

At(KingJohn,NUS) ∧ Smart(KingJohn)<br />

∨ At(Richard,NUS) ∧ Smart(Richard)<br />

∨ At(NUS,NUS) ∧ Smart(NUS)<br />

∨ ...<br />

Artificial Intelligence: <strong>Predicate</strong> <strong>Logic</strong> Slide: 17

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