Assume that 3xVy P(x, y) is false and that the domain of discourse is nonempty. Which of Exercises 89-91 must also be false? Prove your answer. 89. VxVy P(x, y) 2017 90. Vx3y P(x, y) 91. Exy P(x, y)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.2: Graphs Of Equations
Problem 24E
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Assume that Exvy P(x, y) is false and that the domain of discourse
is nonempty. Which of Exercises 89-91 must also be false? Prove
your answer.
89. VxVy P(x, y)
90. Vxay P(x, y)
91. Exay P(x, y)
Transcribed Image Text:Assume that Exvy P(x, y) is false and that the domain of discourse is nonempty. Which of Exercises 89-91 must also be false? Prove your answer. 89. VxVy P(x, y) 90. Vxay P(x, y) 91. Exay P(x, y)
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