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Math Help - innequality proof

  1. #1
    MHF Contributor
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    innequality proof

    prof that if a=<b and d=<c is given than |a-c|=<|b-d|
    from the sum of the given we get a+d=<b+c
    that as far as i went
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  2. #2
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    That is not true.
    Take a=1, b = 2, c=2, d=2
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  3. #3
    A Plied Mathematician
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    If you leave off the magnitude signs, it is true. To prove that statement (without the magnitude signs), you could compare -c with -d.
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