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Math Help - Countabilty

  1. #1
    Senior Member slevvio's Avatar
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    Countabilty [SOLVED]

    Hello, I just had a quick question about countability.

    Let A be a countable set, so there exists a map f: A \rightarrow \mathbb{N} such that f is injective. How can I show that there is a bijection between these sets?

    Any help would be appreciated.
    Last edited by slevvio; September 11th 2011 at 10:56 AM.
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  2. #2
    Senior Member slevvio's Avatar
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    Re: Countabilty [SOLVED]

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