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Math Help - sum of divisor

  1. #1
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    sum of divisor

    How can prove
    σ(n)=Σd<Σ1\d

    where σ(n) maen sum of divisor
    The index of first Σ is d|n and the second Σ is d<n
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  2. #2
    MHF Contributor Drexel28's Avatar
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    Quote Originally Posted by ha11 View Post
    How can prove
    σ(n)=Σd<Σ1\d

    where σ(n) maen sum of divisor
    The index of first Σ is d|n and the second Σ is d<n
    This makes no sense. You're claiming that \sum_{d\mid n}d<\sum_{d<n}\frac{1}{d}?
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