Last Updated：2025/11/27
In many logic textbooks, existential instantiation is introduced as the rule that allows one to replace an existential formula ∃x P(x) with a new constant c and infer P(c).
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In many logic textbooks, existential instantiation is introduced as the rule that allows one to replace an existential formula ∃x P(x) with a new constant c and infer P(c).
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