Covering graph conjecture for 2-token graphs of stars

Let K1,nK_{1,n} be the star graph with nn leaves. Suppose that nn divides (n+12)\binom{n+1}{2}. A combined voltage assignment (α,ω)(\alpha,\omega) on a base graph XX with values in the group Zn\mathbb{Z}_{n} defines a covering graph X(α,ω)X^{(\alpha,\omega)}.

Covering conjecture for 2-token star graphs. The token graph F2(K1,n)F_2(K_{1,n}) is isomorphic to a covering graph X(α,ω)X^{(\alpha,\omega)} of a base graph XX on nkn-k vertices, with combined assignment on the group Zn\mathbb{Z}_{n}.

The conjecture summarizes the preceding examples and discussion for 2-token graphs of stars; no resolution is supplied in the source.

Sources & referencesView supporting material

Primary source

Sergio G. Gómez-Galicia and Octavio B. Zapata-Fonseca, “Edge-transitive token graphs as covers”, arXiv:2505.20632 (2025).

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