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单词 SymmetricMultilinearFunction
释义

symmetric multilinear function


Let R be a commutative ring with identityPlanetmathPlanetmathPlanetmath and M,N be unital R-modules.

Suppose that ϕ:M××MN is a multilinear map, where thereare n copies of M.

Let H be a subgroupMathworldPlanetmathPlanetmath of Sn, the symmetric groupMathworldPlanetmathPlanetmath on {1,,n}, andχ:HR satisfy

  1. 1.

    χ(e)=1

  2. 2.

    χ(g1g2)=χ(g1)χ(g2) for all g1,g2H

We say that ϕ is symmetricPlanetmathPlanetmath with respect to H and χif

ϕ(mσ(1),,mσ(n))=χ(σ)ϕ(m1,,mn)

holds for all σH and all miM.

Now suppose that H=Sn.

If χ=1 then we say that ϕ is a symmetric multilinear function.If χ=ϵ, the sign of the permutationMathworldPlanetmath σ, we say thatϕ is a skew-symmetric multilinear function.

For example, the permanent is a symmetric multilinear function of its rows (columns).

The determinant is a skew-symmetric multilinear function of its rows (columns).

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更新时间:2025/5/5 0:15:16