Test ideals in non-Q-Gorenstein rings
Test ideals in non-Q-Gorenstein rings
复制标题
在非 Q-Gorenstein 环中测试理想值
DOI:
--
复制
发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Karl Schwede
中科院分区:
文献类型:
--
作者:
Karl Schwede
Suppose that $X = Spec R$ is an $F$-finite normal variety in characteristic $p > 0$. In this paper we show that the big test ideal $ au_b(R) = ld au(R)$ is equal to $sum_{Delta} au(R; Delta)$ where the sum is over $Delta$ such that $K_X + Delta$ is $Q$-Cartier. This affirmatively answers a question asked by various people, including Blickle, Lazarsfeld, K. Lee and K. Smith. Furthermore, we have a version of this result in the case that $R$ is not even necessarily normal.