Prove that a set A is countable if and only if there exist a surjection from B onto A.
Prove that a set A is countable if and only if there exist a surjection from B onto A.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.4: Binary Operations
Problem 11E
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4. Prove that a set A is countable if and only if there exist a surjection from B onto A.
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