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Math Help - binary operation

  1. #1
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    binary operation

    how do i tell if the following equations define a binary operation on Z?

    a) m*n=(m+n)/2
    b) m*n=mn^2
    c) m*n=2^(mn)
    d) m*n=sqrt(mn)
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  2. #2
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    Quote Originally Posted by mandy123 View Post
    how do i tell if the following equations define a binary operation on Z?

    a) m*n=(m+n)/2
    b) m*n=mn^2
    c) m*n=2^(mn)
    d) m*n=sqrt(mn)
    Which of these produces integers?
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