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arXiv 0903.2184math.COmath.MG
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度有界(伪)三角剖分的翻转图

Flip Graphs of Degree-Bounded (Pseudo-)Triangulations

Oswin Aichholzer, Thomas Hackl, David Orden, Pedro Ramos, Günter Rote, André Schulz, Bettina Speckmann

摘要:

研究了最大顶点度为常数$k$的三角剖分翻转图。特别地,我们考虑了平面中凸位置上的$n$点集的三角剖分,并证明了它们的翻转图是连通的当且仅当$k > 6$ ;翻转图的直径是$O(n^2)$。我们还证明了,对于一般的点集,点伪三角剖分翻转图可以断开$k \leq 9$,和翻转图的三角剖分可以断开任何$k$。此外,我们考虑一个放松的版本的原始问题。我们允许一个小常数违反度界$k$。在翻转图中,任意两个凸点集的最大度至多为$k$的三角剖分通过一条长为$O(n \log n)$的路相连,其中每个中间三角剖分的最大度至多为$k+4$ .

英文摘要:

We study flip graphs of triangulations whose maximum vertex degree is bounded by a constant $k$. In particular, we consider triangulations of sets of $n$ points in convex position in the plane and prove that their flip graph is connected if and only if $k > 6$; the diameter of the flip graph is $O(n^2)$. We also show that, for general point sets, flip graphs of pointed pseudo-triangulations can be disconnected for $k \leq 9$, and flip graphs of triangulations can be disconnected for any $k$. Additionally, we consider a relaxed version of the original problem. We allow the violation of the degree bound $k$ by a small constant. Any two triangulations with maximum degree at most $k$ of a convex point set are connected in the flip graph by a path of length $O(n \log n)$, where every intermediate triangulation has maximum degree at most $k+4$.

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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