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单词 HomomorphismsOfSimpleGroups
释义

homomorphisms of simple groups


If a group G is simple, and H is an arbitrary group then anyhomomorphismPlanetmathPlanetmathPlanetmathPlanetmathPlanetmathPlanetmathPlanetmathPlanetmathPlanetmath of G to H must either map all elements of G to theidentityPlanetmathPlanetmathPlanetmathPlanetmath of H or be one-to-one.

The kernel of a homomorphism must be a normal subgroupMathworldPlanetmath. Since G issimple, there are only two possibilities: either the kernel is all ofG of it consists of the identity. In the former case, thehomomorphism will map all elements of G to the identity. In thelatter case, we note that a group homomorphism is injective iff the kernelis trivial.

This is important in the context of representation theory. In thatcase, H is a linear group and this result may be restated as sayingthat representations of a simple groupMathworldPlanetmathPlanetmath are either trivial or faithful.

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更新时间:2025/5/4 20:47:08