The bounded-cycle-space fat minor conjecture

From papers

Let XX be a graph, and let GG be a graph whose cycle space is generated by cycles of length at most κ\kappa. A graph is KK-fat-minor-free with respect to XX when it does not contain XX as a KK-fat minor.

Bounded-cycle-space fat minor conjecture. For every graph XX there exists a function f:N2N2f:\mathbb{N}^2\to\mathbb{N}^2 such that, for every graph GG whose cycle space is generated by cycles of length at most κ\kappa, if GG does not contain XX as a KK-fat minor for some KNK\in\mathbb{N}, then GG is f(κ,K)f(\kappa,K)-quasi-isometric to a graph with no XX minor.

This is presented as a still-open special case of the refuted fat minor conjecture. The bounded-cycle-space hypothesis is significant because the known counterexamples do not have cycle spaces generated by cycles of bounded length.

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Sources & referencesView supporting material

Primary source

Sandra Albrechtsen, “A coarse Menger theorem for hyperbolic graphs, finitely presented groups, and more”, arXiv:2606.17605 (2026).

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