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arXiv 0812.3369math.AGmath.DS
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关于P^3中余维1全纯叶理的奇异格式

On the singular scheme of codimension one holomorphic foliations in P^3

Luis Giraldo, Antonio J. Pan-Collantes

摘要:

在这项工作中,我们首先表明,一个全纯叶理与奇异约化当且仅当其正常层是无挠的。此外,当奇异轨迹的余维数至少为2时,证明了约化等价于切层的自反性。我们的主要结果表明,一方面,P^3中余维为1的叶理的切层是局部自由的当且仅当奇异概型是一条曲线,并且它分裂当且仅当该曲线是算术Cohen-Macaulay。另一方面,我们讨论了P^3中的分裂叶理何时由它的奇异概型决定。

英文摘要:

In this work, we begin by showing that a holomorphic foliation with singularities is reduced if and only if its normal sheaf is torsion free. In addition, when the codimension of the singular locus is at least two, it is shown that being reduced is equivalent to the reflexivity of the tangent sheaf. Our main results state on one hand, that the tangent sheaf of a codimension one foliation in P^3 is locally free if and only the singular scheme is a curve, and that it splits if and only if that curve is arithmetically Cohen-Macaulay. On the other hand, we discuss when a split foliation in P^3 is determined by its singular scheme.

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