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arXiv 1907.03072math.SG
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Pearly轨线上的浸没Lagrangian Floer上同调

Immersed Lagrangian Floer cohomology via pearly trajectories

Garrett Alston, Erkao Bao

摘要:

通过对非嵌入点指数满足一定正性条件的分次精确拉格朗日浸入的珍珠轨道计数,定义了$\mathbb Z_2$ -系数上的拉格朗日Floer上同调,并证明了它是拉格朗日浸入在Hamilton变形下的不变量.我们还证明了它与文献[4]中定义的拉格朗日Floer上同调的Hamilton扰动形式自然同构。作为应用,我们证明了这种拉格朗日量在$\mathbb C^n$中的非嵌入点数不小于其贝蒂数之和.

英文摘要:

We define Lagrangian Floer cohomology over $\mathbb Z_2$-coefficients by counting pearly trajectories for graded, exact Lagrangian immersions that satisfy certain positivity condition on the index of the non-embedded points, and show that it is an invariant of the Lagrangian immersion under Hamiltonian deformations. We also show that it is naturally isomorphic to the Hamiltonian perturbed version of Lagrangian Floer cohomology as defined in [4]. As an application, we prove that the number of non-embedded points of such a Lagrangian in $\mathbb C^n$ is no less than the sum of its Betti numbers.

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