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arXiv 2304.13675math.COmath.AT
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图的切割复形的拓扑

Topology of Cut Complexes of Graphs

Margaret Bayer, Mark Denker, Marija Jelić Milutinović, Rowan Rowlands, Sheila Sundaram, Lei Xue

AI总结:

本文定义了图的k-切割复形,推广了Alexander对偶,并利用代数拓扑、离散Morse理论等技术研究了多种图族的可壳性、同伦型和同调性质。

摘要:

我们定义图$G$的$k$-切割复形为单纯复形,其面是$V(G)$中大小为$k$的集合的补集,这些补集诱导$G$的不连通子图。这推广了Fröberg(1990)和Eagon与Reiner(1998)研究的图复形的Alexander对偶。我们描述了各种图操作对切割复形的影响,并利用代数拓扑、离散Morse理论和等变偏序集拓扑的技术,研究了包括树、圈、完全多部图和棱柱$K_n \ imes K_2$在内的各种图族的可壳性、同伦型和同调。

英文摘要:

We define the $k$-cut complex of a graph $G$ with vertex set $V(G)$ to be the simplicial complex whose facets are the complements of sets of size $k$ in $V(G)$ inducing disconnected subgraphs of $G$. This generalizes the Alexander dual of a graph complex studied by Fröberg (1990), and Eagon and Reiner (1998). We describe the effect of various graph operations on the cut complex, and study its shellability, homotopy type and homology for various families of graphs, including trees, cycles, complete multipartite graphs, and the prism $K_n \times K_2$, using techniques from algebraic topology, discrete Morse theory and equivariant poset topology.

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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