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Preprint Aug 2026

A Proof of the Chen--Raspaud Conjecture

For every integer $k\ge2$, Chen and Raspaud conjectured that each graph $G$ with odd girth $\og(G)\ge2k+1$ and maximum average degree $\mad(G)<2+1/k$ has a $(2k+1:k)$-coloring. In this paper, we prove the conjecture.

Qi Wu, Yong Lu · 0 citations
Preprint Aug 2026

Exact random covers of metric trees: balanced rounding, duality, and sharp thresholds

Norin and Turcotte's asymptotically sharp bound for graph burning [J. Combin. Theory Ser. B 168 (2024), 208--235] led them to an exact random-cover conjecture for finite metric trees. Let $U[0,r]$ be the uniform probability measure on $[0,r]$. They conjectured that every finite metric tree $T$ of length $L\ge2r$ admits...

Qi Wu, Yong Lu · 0 citations

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