概型的一般可分代数态射的可升导子
Liftable derivations for generically separably algebraic morphisms of schemes
摘要：
我们考虑支配的、一般代数的和tamely分歧的（如果特征是正的）态射$π: X/S \to Y/S$，其中Y，S是Noether和积分的，X是Krull概型（例如正规Noether），并研究Y上的切向量场提升到X上的切向量场的层.我们给出了一个容易计算的描述，这些向量场使用估值沿临界轨迹。我们推广到积极的特征塞登伯格定理提升切向量场的正规化。如果$π$是一个凝聚理想I的爆破，我们证明了保持I的Ratliff-Rush壳的切向量场是可提升的，并且所有可提升的切向量场保持I的整闭包。
英文摘要：
We consider dominant, generically algebraic, and tamely ramified (if the characteristic is positive) morphisms $π: X/S \to Y/S$, where Y,S are Noetherian and integral and X is a Krull scheme (e.g. normal Noetherian), and study the sheaf of tangent vector fields on Y that lift to tangent vector fields on X. We give an easily computable description of these vector fields using valuations along the critical locus. We generalise to positive characteristic Seidenberg's theorem on lifting tangent vector fields to the normalisation. If $π$ is a blow-up of a coherent ideal I we show that tangent vector fields that preserve the Ratliff-Rush hull of I are liftable, and that all liftable tangent vector fields preserve the integral closure of I.
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