Let f be a one-to-one function from A to B, with B being finite. Prove that A is finite.
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Originally Posted by Jdg6057 Let f be a one-to-one function from A to B, with B being finite. Prove that A is finite. Suppose that is injective. Note that means Using that property; is collection of pair-wise disjoint subsets of . If is finite then what can you say about ?
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