Talk:Möbius inversion formula
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In the definition section, the article says
The formula is also correct if f and g are functions from the positive integers into some abelian group.
How is one to make sense of g(d) μ(n/d) if these values only have a group operation (addition) defined on them?
It seems that it should say "... into some commutative ring."
132.206.150.179 03:18, 10 December 2006 (UTC)