the Mobius function

Alonso Del Arte alonso.delarte at
Wed Dec 15 22:26:28 CET 2004

Mathematica yields 0 for mu(0), MoebiusMu[0]. For a negative number n,
it yields the same value as |n|.

Is there a common or famous implementation of the Möbius
function? (Like the famous recursion implementation of factorials,
where 0! = 1).


On Wed, 15 Dec 2004 18:54:08 +0000, hv at <hv at> wrote:
> Emeric Deutsch <deutsch at> wrote:
> :As far as I know, the Mobius function (mu) is defined only for
> :positive integers.
> :Is there a natural or customary assignment for n=0 ?
> :Maple yields mu(0)=-1.
> I don't think there is any natural extension to 0, except maybe mu(0) = 0:
> in general, I wouldn't expect any multiplicative function to have a natural
> extension to 0.
> mu(0) = 0 can be justified (sort of) by saying that it is divides any prime
> more than once (in fact an infinite number of times). But I can't offhand
> think of a way to make the extension relevant.
> Hugo van der Sanden

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