Test ideals in non-Q-Gorenstein rings

Test ideals in non-Q-Gorenstein rings
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在非 Q-Gorenstein 环中测试理想值

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发表时间:
2009
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通讯作者:
Karl Schwede
Karl Schwede
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作者:
Karl Schwede

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设X = Spec R是特征p > 0的F有限正规簇.在本文中,我们表明,大测试理想$ Au_B(R)= LD Au(R)$等于$sum_{Delta} Au(R; Delta)$其中和超过$Delta$使得$K_X + Delta$为$Q$-卡地亚。这肯定地回答了许多人提出的一个问题,包括Blickle,Lazarsfeld,K。Lee和K.史密斯此外,我们有一个版本的这个结果的情况下,$R$甚至不一定正常。
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.