(a) Let p (x), q (x) be open statements in the variable x, with a given universe....
Question:
∀x p(x) ∨ ∀x q(x) ⇒ ∀x [p(x) ∨ q(x)].
[That is, prove that when the statement ∀x p(x) ∨ ∀x q(x) is true, then the statement ∀x [p(x) ∨ g(x)] is true.]
(b) Find a counterexample for the converse in part (a). That is, find open statements p(x), q (x) and a universe such that ∀x [p(x) ∨ q(x)] is true, while ∀x p(x) ∨ ∀x q(x) is false.
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Related Book For
Discrete and Combinatorial Mathematics An Applied Introduction
ISBN: 978-0201726343
5th edition
Authors: Ralph P. Grimaldi
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