Answer
\[\tilde{\ }\left( p\leftrightarrow q \right)\] and \[\tilde{\ }p\vee \tilde{\ }q\] are not equivalent.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 3 - Logic - Chapter Summary, Review, and Test - Review Exercises - Page 208: 37
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