论文标题
离散表面和PL-manifolds的一些结构和枚举方面
Some structural and enumerative aspects of discrete surfaces and PL-manifolds
论文作者
论文摘要
该手稿讲述了作者对代数和列举组合学的一些贡献。我们专注于两部分图的概括,它们是嵌入在表面上的两部分图。已知地图出现在理论物理学和离散数学的许多领域中,但是基本计算机科学的一个关键兴趣是它们在某种意义上是多方面的,因为存在多个编码,这些编码不可互换,例如Tutte的/loop方程,拓扑,拓扑,拓扑,KP层次和许多使田野变得如此丰富。我们认为的一个概括是加权的赫维兹数字,包括星座,单调赫维兹数字和无针对性的chapuy-dołęga。我们已经调查了某些映射的通用结构是否提高到加权的Hurwitz数字,从而使拓扑递归(对于面向的,双重的,加权的Hurwitz数字),以及从KP到BKP层次结构的通过,以获得一些无方向性的加权Hurwitz数字(例如单调的单位酮)。我们认为的两分图的另一个概括是在三个及以上的维度上有色三角剖分。它们为拓扑和组合学提供了一个不错的见面,可以研究高于维度2的通用类别。特别是,我们发现,在固定数量的四面体数以最大化边缘的边缘数量是与树木一起射击的3球。但是,在甚至在维度上,我们发现可以根据构建块的选择来达到更多的普遍性类。我们还想知道,地图提出的某些通用结构是否提高到更高的维度。特别是,我们证明了该方案分解的实例,并在三维模型和带有交叉环装饰的地图中证明了该方案的实例,我们证明了只有轻度假设的斑点拓扑递归。
This manuscript recounts some of the author's contributions to algebraic and enumerative combinatorics. We have focused on two types of generalizations of bipartite maps, which are bipartite graphs embedded on surfaces. Maps are known to appear in many areas of theoretical physics and discrete mathematics, but one key interest for fundamental computer science is how multi-facetted they are in the sense that multiple encodings exist which are not interchangeable, like Tutte's/loop equations, the topological recursion, the KP hierarchy and numerous bijections which made the field so rich. One generalization we considered is weighted Hurwitz numbers, including constellations, monotone Hurwitz numbers and the unoriented versions of Chapuy-Dołęga. We have investigated whether some universal structures of maps lift to weighted Hurwitz numbers, such that the topological recursion (it does, for oriented, double, weighted Hurwitz numbers), and the passage from the KP to the BKP hierarchy for some unoriented weighted Hurwitz numbers (like monotone ones). The other generalization of bipartite maps we considered is colored triangulations in dimensions three and higher. They provide a nice meeting ground for topology and combinatorics, where universality classes above dimension 2 can be investigated. In particular, we found that the gluings of 3-balls which maximize the number of edges at fixed number of tetrahedra are in bijection with trees. In even dimensions however, we found that more universality classes can be reached depending on the choice of building blocks. We also wondered whether some of the universal structures featured by maps lift to higher dimensions. In particular, we proved instances of the scheme decomposition in three-dimensional models and maps decorated with crossing loops, and we proved the blobbed topological recursion with only mild assumptions.