Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 3 - The Logic of Quantified Statements - Exercise Set 3.3 - Page 130: 24

Answer

∼(∀x ∈ D(∀y ∈ E(P(x, y)))) $\equiv$ ∃x ∈ D(∼(∀y ∈ E(P(x, y)))) $\equiv$ ∃x ∈ D(∃y ∈ E(∼P(x, y)))

Work Step by Step

Recall the negation of a for all statement: ~($\forall x$ in D, P(x)) $\equiv$ $\exists x$ in D such that ~P(x). To negate a multiply quantified statement, apply the laws from in stages moving left to right along the sentence.
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