Answer: Show that if f is a function from S to T, where S
Chapter 5, Problem 5.2.8(choose chapter or problem)
Show that if f is a function from S to T, where S and T are finite sets with lSI > ITI, then there are elements Sl and S2 in S such that f(sd = f(sz), or in other words, f is not one-to-one
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