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Math Help - Set Theory help..

  1. #1
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    Set Theory help..



    Thank you..
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  2. #2
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    This is not a homework service
    slipz418, you have posted a set of three problems.
    They are nice problems.
    What do you expect from us?
    Remember that this is not a homework service
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  3. #3
    Member
    Joined
    Oct 2009
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    I'll try to give you some guidance,

    the definition of one-to-one is:

     \forall x,y \in \mathbb{R} f(x)=f(y) \implies x = y

    and onto:

    \forall y \in \mathbb{R} \exists x \in \mathbb{R}  f(x) = y.

    Also to prove that something is not one to one you need to find x,y\in \mathbb{R} such that f(x) = f(y) and x \neq y.

    Hope that helps.
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