The Shortest Cycle Cover Conjecture

For a bridgeless graph GG, let scc(G)scc(G) denote the length of a shortest cycle cover of GG. Shortest Cycle Cover Conjecture. If GG is a bridgeless graph, then

scc(G)75E(G).scc(G)\leq \frac{7}{5}|E(G)|.

This conjecture gives a sharp proposed upper bound for shortest cycle covers and is related in the paper to the parameter T(G)T(G). It remains open.

Sources & referencesView supporting material

Primary source

Giuseppe Mazzuoccolo and Vahan Mkrtchyan, “Expanding vertices to triangles in cubic graphs”, arXiv:2504.19201 (2025).

Additional references

2 papers in this index state this conjecture (2020–2025). The statement above is taken from the most recent of them; the others are arXiv:2004.14049.

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