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Let f XY be a function. (i) Let BCY be a subset. Prove that f(f(B)) = B if and only if BC image f.
Let f XY be a function. (i) Let BCY be a subset. Prove that f(f(B)) = B if and only if BC image f. (ii) Prove that AC f(f(A)) for all A CX.
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A First Course In Abstract Algebra
Authors: John Fraleigh
7th Edition
0201763907, 978-0201763904
