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arXiv 2104.10084math.COmath-phmath.MPmath.PR
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具有三个紧边界的平面二分映射的双射enumeration,或者如何切片裤子

Bijective enumeration of planar bipartite maps with three tight boundaries, or how to slice pairs of pants

Jérémie Bouttier, Emmanuel Guitter, Grégory Miermont

摘要:

我们考虑有三条边界的平面地图,俗称裤子。在控制面度的二分映射的情况下,Eynard发现了它们的生成函数的一个简单表达式,Collet和Fusy证明了它的双射性。本文给出了\emph{tight}裤子对的一个更简单的公式,即对于其边界在其同伦类中具有最小长度的映射。我们遵循一个双射方法的切片分解的基础上,我们通过引入新的基本构建块称为bigodesic三角形和diangles,并通过工作的三重穿孔领域的通用覆盖扩展。我们还讨论了(不一定紧)对裤子和annuli的最小分离回路的长度的统计,以及它们在大体积极限下的渐近性。

英文摘要:

We consider planar maps with three boundaries, colloquially called pairs of pants. In the case of bipartite maps with controlled face degrees, a simple expression for their generating function was found by Eynard and proved bijectively by Collet and Fusy. In this paper, we obtain an even simpler formula for \emph{tight} pairs of pants, namely for maps whose boundaries have minimal length in their homotopy class. We follow a bijective approach based on the slice decomposition, which we extend by introducing new fundamental building blocks called bigeodesic triangles and diangles, and by working on the universal cover of the triply punctured sphere. We also discuss the statistics of the lengths of minimal separating loops in (non necessarily tight) pairs of pants and annuli, and their asymptotics in the large volume limit.

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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