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Product structure of graphs with an excluded minor

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arxiv 2104.06627 v6 pith:BWO7XARC submitted 2021-04-14 math.CO

classification math.CO
keywords graphtheoremtreewidthboundsgraphsincludeminor-freeoptimal
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abstract

This paper shows that $K_t$-minor-free (and $K_{s, t}$-minor-free) graphs $G$ are subgraphs of products of a tree-like graph $H$ (of bounded treewidth) and a complete graph $K_m$. Our results include optimal bounds on the treewidth of $H$ and optimal bounds (to within a constant factor) on $m$ in terms of the number of vertices of $G$ and the treewidth of $G$. These results follow from a more general theorem whose corollaries include a strengthening of the celebrated separator theorem of Alon, Seymour, and Thomas [J. Amer. Math. Soc. 1990] and the Planar Graph Product Structure Theorem of Dujmovi\'c et al. [J. ACM 2020].

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  1. Short Paths in the Planar Graph Product Structure Theorem

    math.CO 2025-02 conditional novelty 8.0 of 10

    Every n-vertex planar graph is contained in H ⊠ P ⊠ K_c for some planar H of treewidth 3 and a path P of length O((tw(G)+1)^(1-ε) n^ε).

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