Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Appendix A - The Language of Mathematics - Exercises - Page A5: 3


The time is not 4 o’clock.

Work Step by Step

We set $A$ to refer to the time, which is 4 o'clock; thus, $A$ is true. The negation of $A$ must be false, so we can say: The time is not 4 o’clock
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