de Jong-Oort纯度定理的改进
An Improvement of de Jong-Oort's Purity Theorem
摘要:
考虑一个$F$ -晶体在一个诺特方案$S$上。德容-奥尔特的纯度定理指出,相关的牛顿多边形的所有点的$S$是恒定的,如果这是真的以外的一个子集的余维大于1。在本文中,我们显示了一个改进的定理,这说,牛顿多边形在所有点的$S$有一个共同的断点,如果这是真的余维数大于1的子集之外。
英文摘要:
Consider an $F$-crystal over a noetherian scheme $S$. De Jong--Oort's purity theorem states that the associated Newton polygons over all points of $S$ are constant if this is true outside a subset of codimension bigger than 1. In this paper we show an improvement of the theorem, which says that the Newton polygons over all points of $S$ have a common break point if this is true outside a subset of codimension bigger than 1.
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