Multiplicative Invariants and Semigroup Algebras
by Lorenz, Martin
Let G be a finite group acting by automorphism on a lattice A, and hence on the group algebra S=k[A]. The algebra of G-invariants in S is called an algebra of multiplicative invariants. We present an explicit version of a result of Farkas stating that multiplicative invariants of finite reflection groups are semigroup algebras.
DOI: 10.1023/A:1011415025465
Print publication date: 8/1/2001
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