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arxiv: math/0607380 · v1 · submitted 2006-07-17 · 🧮 math.AC · math.CO

Convex cones and SAGBI bases of permutation invariants

classification 🧮 math.AC math.CO
keywords permutationringsagbiactingadmissiblebasesbasiscones
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Let G be a permutation group acting on {1,...,n}, and < be any admissible term order on the polynomial ring K[x_1,...,x_n]. We prove that the invariant ring K[x_1,...,x_n]^G of G has a finite SAGBI basis if, and only if, G is generated by reflections.

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