A note on discreteness of $F$-jumping numbers

A note on discreteness of $F$-jumping numbers
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关于 $F$ 跳跃数字离散性的注释

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发表时间:
2010
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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R是特征p > 0的理想域上的本质有限型环,且R的子集是理想。我们证明了$的$F$-跳数集 Au_(B)(R; a^t)$在假设$R$是正态的并且$Q$-Gorenstein --我们确实假设$Q$-Gorenstein指数不能被$p$整除的情况下没有极限点。此外,我们还证明了$F$-跳跃数 Au_B(R; Delta,a^t)$在更一般的假设下是离散的,即$K_R + Delta$是$R$-卡地亚。
Suppose that $R$ is a ring essentially of finite type over a perfect field of characteristic $p > 0$ and that $a subseteq R$ is an ideal. We prove that the set of $F$-jumping numbers of $ au_b(R; a^t)$ has no limit points under the assumption that $R$ is normal and $Q$-Gorenstein -- we do emph{not} assume that the $Q$-Gorenstein index is not divisible by $p$. Furthermore, we also show that the $F$-jumping numbers of $ au_b(R; Delta, a^t)$ are discrete under the more general assumption that $K_R + Delta$ is $R$-Cartier.