Zhang's prescribed-vertex complementary cycle conjecture for regular bipartite tournaments

Let DD be a kk-regular bipartite tournament, where kk is an integer greater than 22, and let uu and vv be two specified vertices of DD. Let F4kF_{4k} and the other specified exceptional families be the digraphs excluded below. Zhang and collaborators' conjecture. If DD is isomorphic to neither F4kF_{4k} nor any of the other specified families of digraphs, then for every even pp satisfying

4pV(D)4,4\leq p\leq |V(D)|-4,

DD has a cycle CC of length pp such that DCD\setminus C is hamiltonian, CC contains uu, and DCD\setminus C contains vv. This conjecture prescribes one vertex on the selected cycle and another on its hamiltonian complement; its status is not resolved in the supplied source.

Sources & referencesView supporting material

Primary source

Stéphane Bessy and Jocelyn Thiebaut, “Complementary cycles of any length in regular bipartite tournaments”, arXiv:2102.04514 (2021).

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