# Concept derivation guides

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Concept guide



## [The full unit permutation modulo 10](/en/derivations/derivation-mko-euler-theorem-number-theory-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-euler-theorem-number-theory)

For a=-3,n=10, phi(10)=4 and a^4=1 modulo 10.

Euler's theorem in number theory

derivation-mko-euler-theorem-number-theory-01





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