Prove that if f: A → B is a 1-1 function and B is countable, then A is countable.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.5: Permutations And Inverses
Problem 7E: Prove that if f is a permutation on A, then (f1)1=f.
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