Composite-flow coverage conjecture for elementary abelian 2-groups

Let GG be a graph, and let F(G,Z2k)\mathcal{F}(G,\mathbb{Z}_2^k) denote the reconfiguration graph of nowhere-zero Z2k\mathbb{Z}_2^k-flows. A nowhere-zero Z2k\mathbb{Z}_2^k-flow f=(f1,,fk)f=(f_1,\ldots,f_k) is composite if there is a partition A,BA,B of {1,,k}\{1,\ldots,k\} such that, for every edge eE(G)e\in E(G), there are iAi\in A and jBj\in B for which ee is in the support of both fif_i and fjf_j. The composite-flow coverage conjecture. There is an integer k9k\geq 9 such that, for any 2-edge-connected graph GG, every connected component of F(G,Z2k)\mathcal{F}(G,\mathbb{Z}_2^k) contains a composite flow. The conjecture proposes that composite flows occur in every reconfiguration component, but its status remains open.

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Primary source

Louis Esperet, Kevin Hendrey, Aurélie Lagoutte, Margaux Marseloo, Sergey Norin and Raphael Steiner, “Nowhere-zero flow reconfiguration”, arXiv:2512.17342 (2026).

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