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单词 ProofOfTheConverseOfLagrangesTheoremForFiniteCyclicGroups
释义

proof of the converse of Lagrange’s theorem for finite cyclic groups


The following is a proof that, if G is a finite cyclic groupMathworldPlanetmath and n is a nonnegative integer that is a divisorMathworldPlanetmathPlanetmath of |G|, then G has a subgroupMathworldPlanetmathPlanetmath of order n.

Proof.

Let g be a generatorPlanetmathPlanetmathPlanetmath of G. Then |g|=|g|=|G|. Let z such that nz=|G|=|g|. Consider gz. Since gG, then gzG. Thus, gzG. Since |gz|=|gz|=|g|gcd(z,|g|)=nzgcd(z,nz)=nzz=n, it follows that gz is a subgroup of G of order n.∎

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