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arXiv math/9904179math.SGmath.DGmath.GT
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基于辛几何的简单非有理凸多胞体

Simple Non-Rational Convex Polytopes via Symplectic Geometry

Elisa Prato

摘要:

在这篇文章中,我们考虑流形和orbifolds的一个推广,我们称之为quasifolds;维数k的quasifolds通过离散群的作用与R^k的商局部同构--特别是它们不是Hausdorff拓扑空间。在这种几何中,环面的类似物是准环面。本文定义了拟托在辛拟褶皱上的Hamilton作用,并证明了任何简单的凸多胞体,不论有理与否,都是辛拟褶皱上一类有效Hamilton作用的矩映射的象,这些作用的维数是相应拟托的两倍.

英文摘要:

In this article we consider a generalization of manifolds and orbifolds which we call quasifolds; quasifolds of dimension k are locally isomorphic to the quotient of R^k by the action of a discrete group - tipically they are not Hausdorff topological spaces. The analogue of a torus in this geometry is a quasitorus. We define Hamiltonian actions of quasitori on symplectic quasifolds and we show that any simple convex polytope, rational or not, is the image of the moment mapping for a family of effective Hamiltonian actions on symplectic quasifolds having twice the dimension of the corresponding quasitorus.

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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