计算机逻辑基础

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+What is the definition of validity for a propositional logic formula?
+PLz explain how to determine whether a given propositional logic formula with CNF is valid.
+
+Please illustrate the different treatment for free and bound variables in the semantical evaluation of a predicate logic formula.
+
+Please state the key idea of program verification using model checking techniques.
+
+Prove the following sequent doesn't hold using semantical evaluation:
+∀x∃y P(x,y) |- ∃y∀x P(x,y)
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