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Math Help - Functions

  1. #1
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    Functions

    How this one a function

    {[ -2,-1), (-1,0), (0,1), (1,2) (2,2)}

    but this one isnt

    {(-4,1), (-2,1), (-2,0)

    I thought functions cant have the same number appearing more than once in a relation?
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  2. #2
    Member anonimnystefy's Avatar
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    Re: Functions

    a relation is a function if all ordered pairs have different first elements,but second can be the same.
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  3. #3
    MHF Contributor Siron's Avatar
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    Re: Functions

    What's the definition of a function? ...

    EDIT:
    Anonimnystefy has given the defintion, but to be more exact, if you have given a functon f:A \to B then:
    \forall a \in A, \exists! b\in B: (a,b)\in f
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