有理映射的合成对上同调的作用
The action on cohomology by compositions of rational maps
摘要:
利用代数拓扑和相交理论的直观结果,阐明了有理映射的复合对上同调的拉回作用。我们使用这些技术来证明一个简单的充分的标准functorality的组成的两个合理的地图上的所有程度的上同调,然后我们reprove的标准Diller-Favre,贝德福德-金,和Dinh-Sibony。最后,我们举一个警示性的例子。
英文摘要:
We use intuitive results from algebraic topology and intersection theory to clarify the pullback action on cohomology by compositions of rational maps. We use these techniques to prove a simple sufficient criterion for functoriality of a composition of two rational maps on all degrees of cohomology and we then reprove the criteria of Diller-Favre, Bedford-Kim, and Dinh-Sibony. We conclude with a cautionary example.
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