# Concept derivation guides

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Concept guide



## [Complete factorization and mu(30)](/en/derivations/derivation-mko-mobius-function-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-mobius-function)

mu(30)=-1, mu(12)=0, mu(1)=1; the sum over every divisor of 30 is zero.

Mobius function

derivation-mko-mobius-function-01





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