群概型作用的分解性质
Factorisation properties of group scheme actions
摘要:
设H是域k上的代数群概型,作用于唯一因子分解整环的交换k-代数A.我们证明了,在一定的温和的假设下,非零H-稳定主理想在A的幺半群是自由交换的。由此,我们推出,在某些特殊情况下,结果的非零半不变量和代数的不变量的幺半群。
英文摘要:
Let H be an algebraic group scheme over a field k acting on a commutative k-algebra A which is a unique factorisation domain. We show that, under certain mild assumptions, the monoid of nonzero H-stable principal ideals in A is free commutative. From this we deduce, in certain special cases, results about the monoid of nonzero semi-invariants and the algebra of invariants.
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