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arXiv 1306.5304math.SGmath.DGmath.GT
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拉格朗日曲面的外科手术和不变量

Surgery and Invariants of Lagrangian Surfaces

Mei-Lin Yau

摘要:

我们考虑了一种称为拉格朗日附盘手术的手术,它可以在拉格朗日附盘D存在的情况下应用于拉格朗日曲面L,以获得总是光滑地与L同位素的新拉格朗日曲面L'。我们表明,这种类型的手术包括所有甚至广义德恩扭曲所构建的保罗赛德尔。对于可平行化的辛4-流形W中的可定向闭拉格朗日曲面,我们构造了一个新的辛不变量,称为y-指标。利用y指标证明了L和L'不是Hamilton同位素。我们还得到了新的零同调拉格朗日环面的例子,这是光滑的同位素,但不是哈密顿同位素。

英文摘要:

We considered a surgery, called Lagrangian attaching disk surgery, that can be applied to a Lagrangian surface L at the presence of a Lagrangian attaching disk D, to obtain a new Lagrangian surface L' which is always smoothly isotopic to L. We showed that this type of surgery includes all even generalized Dehn twists as constructed by Paul Seidel. We also constructed a new symplectic invariant, called y-index, for orientable closed Lagrangian surfaces immersed in a parallelizable symplectic 4-manifold W. With y-index we proved that L and L' are not Hamiltonian isotopic. We also obtained new examples of nullhomologous Lagrangian tori which are smooth isotopic but not Hamiltonian isotopic.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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