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Determine Whether the Given Argument Is Valid or Invalid

Question 130

Essay

determine whether the given argument is valid or invalid. If it is valid, derive the conclusion using our rules of inference and equivalence. If it is invalid, provide a counterexample.
-1. (?x)[Tx ? (?y)(Sy • Wxy)]
2. (?x)(Sx • Vx)
3. (?x)(Tx • Rx) / (?x)[(Rx • Vx) • (?y)Wxy]

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Invalid. There is a counterexample in a ...

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