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 1.1 - Propositional Logic - Exercises - Page 16: 50

Answer

No

Work Step by Step

If there was such a barber, who would shave him? If he shaved himself, he would be one of the people shaven by this legendary barber, who $only$ shave people that do not shave themselves: obviously a contradiction. If he did not shave by himself, he should be shaven by the barber, since he shaves $all$ the people that do not shave themselves: another contradiction. Therefore, such a barber cannot exists.
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