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Math Help - countable

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    countable

    Let f be a one-to-one function from A into B, with B countable. Prove that A is countable.
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    Quote Originally Posted by Jdg6057 View Post
    Let f be a one-to-one function from A into B, with B countable. Prove that A is countable.
    Use the same proof as in http://www.mathhelpforum.com/math-he...nite-sets.html
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