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 129: 7

Answer

This is true because triangle d is above every square.

Work Step by Step

Recall that if you want to establish the truth of a statement of the form: $\exists x \in D$ such that $\forall y \in E$, P(x,y), you job is to find one particular x in D that will "work" no matter what y in E anyone might choose to challenge you with.
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