Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 1 - Section 1.8 - Proof Methods and Strategy - Supplementary Exercises - Page 113: 34

Answer

The mathematical Expression of the given expression is $\exists z \exists y \forall x P(x, y, z)$

Work Step by Step

Let us consider: P(x, y, z) = “Room x of building y of college z is painted white” Domain x: all rooms Domain y: all buildings of a campus Domain z: all college in the United States We can note form the expression that “there is a building on the campus of some college in the United States in which every room is painted white.” The room depends on the college and building, while the building depends upon the college. Using the above interpretations, we can then rewrite the statement as the mathematical expression: $\exists z \exists y \forall x P(x, y, z)$
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