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

Let n,k∈Nn,k∈\mathbb{N} with k≤nk≤n. Let GG be an nn-vertex graph whose degree sequence is d1≥⋯≥dnd_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<2k−ifor 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.

References

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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