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Unformatted text preview: Let X and Y be (nonempty) sets and let f : X Y be a bijection. Prove that X is countable if and only if Y is countable. [ Suggestion: Consider the nite and innite cases separately.]...
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This note was uploaded on 02/29/2012 for the course MATH 3326 taught by Professor Ryandaileda during the Fall '09 term at Trinity University.
 Fall '09
 RyanDaileda
 Math

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