Group actions and invariants in algebras of generic matrices

Details Group actions and invariants in algebras of generic matrices Group actions and invariants in algebras of generic matrices

2005-07-27

arxiv.org/abs/math/0507548v2

Advances in Applied Math. 37 (2006), no. 4, 481--500.

Mathematics

Rings and Algebras

22 pages. Final version, to appear in Advances in Applied Mathematics (Amitai Regev issue). Theorem 1.3 has been strengthened

Scientific paper

10.1016/j.aam.2005.08.007

We show that the fixed elements for the natural GL_m-action on the universal division algebra UD(m,n) of m generic n x n matrices form a division subalgebra of degree n, assuming n >= 3 and 2 <= m <= n^2 - 2. This allows us to describe the asymptotic behavior of the dimension of the space of SL_m-invariant homogeneous central polynomials p(X_1,...,X_m) for n x n matrices. Here the base field is assumed to be of characteristic zero.

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