Yanbo Zhang

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20242026

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math.CO2026

Erdős--Ko--Rado theorems in $ℓ_{2}$ -norm for three finite spaces

Qian Bao, Yaojun Chen, Yanbo Zhang

Let $F$ be a $k$ -uniform hypergraph. The famous Erdős--Ko--Rado (1961) theorem determines the maximum size and extremal structure for $F$ being $t$ -intersecting…

math.CO2026

A note on tree-cycle Ramsey numbers

Ting Huang, Yanbo Zhang, Yaojun Chen

Let $R (T_{n}, C_{m})$ denote the Ramsey number of a tree $T_{n}$ on $n$ vertices versus a cycle $C_{m}$ of length $m$ . Burr, Erdős, Faudree, Rousseau, and Schelp (1982) asked for the least…

math.CO2026

Online Ramsey numbers of the claw versus cycles

Hexuan Zhi, Yanbo Zhang

The online Ramsey number $r ~ (G, H)$ is defined via a Builder--Painter game on an empty graph with countably many vertices. In each round, Builder reveals an edge, which Painte…

Erdős--Ko--Rado theorems in ℓ2​-norm for three finite spaces

A note on tree-cycle Ramsey numbers

Online Ramsey numbers of the claw versus cycles

Erdős--Ko--Rado theorems in $ℓ_{2}$ -norm for three finite spaces