Composite-flow coverage conjecture for elementary abelian 2-groups

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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 e∈E(G)e\in E(G), there are i∈Ai\in A and j∈Bj\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 k≥9k\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.

References

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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