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Symmetric power

From Wikipedia, the free encyclopedia

In mathematics, the n-th symmetric power of an object X is the quotient of the n-fold product by the permutation action of the symmetric group .

More precisely, the notion exists at least in the following three areas:

  • In linear algebra, the n-th symmetric power of a vector space V is the vector subspace of the symmetric algebra of V consisting of degree-n elements (here the product is a tensor product).
  • In algebraic topology, the n-th symmetric power of a topological space X is the quotient space , as in the beginning of this article.
  • In algebraic geometry, a symmetric power is defined in a way similar to that in algebraic topology. For example, if is an affine variety, then the GIT quotient is the n-th symmetric power of X.

References

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  • Eisenbud, David; Harris, Joe, 3264 and All That: A Second Course in Algebraic Geometry, Cambridge University Press, ISBN 978-1-107-01708-5
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