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Shu-Yan Chen

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Preprint Aug 2026

Sparse chromatic graphs and the complete-graph triangle bound

We prove that there is an absolute constant $c>0$ such that every graph of chromatic number at least $r$ and at most $cr^3\log^2 r$ edges contains at least $\binom r3$ triangles. The proof has three ingredients. First, a sparse-core argument based on a triangle-sensitive coloring estimate of Harris extracts, from any c...

Shu-Yan Chen · 0 citations
Preprint Aug 2026

Cyclic Sources of Strong Domination in Graph Norms

Conlon and Lee asked for strongly dominating graphs beyond norming graphs and even paths. We construct a two-parameter family of pairwise non-isomorphic $2$-connected strongly dominating graphs that are not seminorming, and hence lie outside the two classes of examples previously identified for signed strong domination...

Shu-Yan Chen · 0 citations
Preprint Aug 2026

Odd-Cycle Span Defect: A Polynomial Lower Bound and a Square-Root Upper Bound

For a graph $G$, let $\psi(G)=\max\{\chi(G[V(C)]):C$ is an odd cycle of $G\}$, with $\psi(G)=0$ when $G$ is bipartite. For positive integers $N$, set $F(N)=\max\{\chi(G)-\psi(G):|V(G)|\le N\}$. The function $F$ measures the finite-order additive gap arising from an open problem of Erdos and Hajnal. We prove $N^{1/6-o(1...

Shu-Yan Chen · 1 citation

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