Balogh-Kostochka-Treglown degree-sequence conjecture for equitable colorings

From papers

Let n,kNn,k∈\mathbb{N} with knk≤n. Let GG be an nn-vertex graph whose degree sequence is d1dnd_1≥⋯≥d_n. Let an equitable kk-coloring be a proper kk-coloring whose color classes have sizes differing by at most one. Degree-sequence equitable-coloring conjecture. If

di<2kifor all i<k,d_i<2k-i\quad\text{for all }i<k,

and

dk+1<k,d_{k+1}<k,

then GG contains an equitable kk-coloring.

This conjecture is proposed as a degree-sequence analogue of the Hajnal-Szemerédi conjecture, inspired by work of Balogh, Kostochka, and Treglown. Its general status is open.

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Sources & referencesView supporting material

Primary source

Yangyang Cheng, Zhenyu Li, Wanting Sun and Guanghui Wang, “A step toward Chen-Lih-Wu conjecture”, arXiv:2511.03957 (2025).

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