Prove each of the following assertions: a. a is valid if and only if True a. b.

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Prove each of the following assertions:

a. a is valid if and only if True a.

b. For any

a, False a.

c. a + ,G' if and only if the sentence (a + P) is valid.

d. a r p if and only if the sentence (a w P) is valid.

e. a /= p if and only if the sentence (a A 1P) is unsatisfiable.

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