arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2207.01320math.GR
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直角建筑的城市产品及其普遍群体

City products of right-angled buildings and their universal groups

Jens Bossaert, Tom De Medts

摘要:

我们引入了直角建筑的城市产品的概念,它从较小的建筑中产生了一个新的直角建筑。更准确地说,如果$M$是秩为$n$的直角Coxeter图,并且$Δ_1,\dots,Δ_n$是直角建筑物,则我们构造一个新的直角建筑物$Δ:= \mathrm{cityproduct}_M(Δ_1,\dots,Δ_n)$。我们可以将建筑物$Δ_1,\dots,Δ_n$恢复为$Δ$的残基,但我们也可以从$Δ$构建$M$类型的骨架建筑物,该骨架建筑物捕获$Δ$的大尺度几何形状。然后,我们继续研究城市产品的直角建筑物的泛群,我们表明,泛群的$Δ$的建筑物$Δ_1,\dots,Δ_n$和结构的$M$的泛群可以表示。作为一个应用,我们展示了许多例子的存在对不同的建筑物的同一类型,承认(拓扑)同构的通用群,从而大大推广了最近的例子由劳拉Beßmann。

英文摘要:

We introduce the notion of city products of right-angled buildings that produces a new right-angled building out of smaller ones. More precisely, if $M$ is a right-angled Coxeter diagram of rank $n$ and $Δ_1,\dots,Δ_n$ are right-angled buildings, then we construct a new right-angled building $Δ:= \mathrm{cityproduct}_M(Δ_1,\dots,Δ_n)$. We can recover the buildings $Δ_1,\dots,Δ_n$ as residues of $Δ$, but we can also construct a skeletal building of type $M$ from $Δ$ that captures the large-scale geometry of $Δ$. We then proceed to study universal groups for city products of right-angled buildings, and we show that the universal group of $Δ$ can be expressed in terms of the universal groups for the buildings $Δ_1,\dots,Δ_n$ and the structure of $M$. As an application, we show the existence of many examples of pairs of different buildings of the same type that admit (topologically) isomorphic universal groups, thereby vastly generalizing a recent example by Lara Beßmann.

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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