'4 2 8 ways' presentation slideshows

4.2 Permutations of sets

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4.1.2 Pigeonhole principle:Strong Form

Theorem 3.7:(a) Let f be a function from A to B, Inverse relation f -1 is a function from B to A if only if f is one to one (b) Let f be an everywhere function from A to B, Inverse relation f -1 is an everywhere function from B to A if only if f is one-to-one correspondence.

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4.1.2 Pigeonhole principle:Strong Form

4.1.2 Pigeonhole principle:Strong Form.

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