(a) Suppose that I is an injection. Show that I-I 0 I(x) =x for all x E D(f) and that 10
Chapter 1, Problem 18(choose chapter or problem)
(a) Suppose that I is an injection. Show that I-I 0 I(x) =x for all x E D(f) and that 10 1-1(y) =y for all y E R(f). (b) If I is a bijectionof A onto B, showthat 1-1 is a bijectionof B onto A. 1
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