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Math Help - Functional Equation

  1. #1
    Banned
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    Functional Equation

    Find all functions f defined on nonnegative integers taking nonnegative integer values such that

    f(f(m) + f(n)) = m + n

    for all nonnegative integers m, n.
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  2. #2
    Grand Panjandrum
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    USA MTS 2008/9 problem, thread closed

    CB
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