I saw this question in few book but no detail, hope someone can show the working. Use the Mobius inversion formula to prove
Thank you for your help.
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Both follow directly from Möbius inversion formula. Möbius inversion formula Given an arithmetic fuction
Then we have (number of positive divisors) and
Last edited by PaulRS; Apr 15th 2008 at 06:01 PM.
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