Meunier Conjecture

Coloring Properties of Categorical Product of General Kneser Hypergraphs

More than 50 years ago Hedetniemi conjectured that the chromatic number of categorical product of two graphs is equal to the minimum of their chromatic numbers. This conjecture has received a considerable attention in recent years. Hedetniemi's conjecture were generalized to hypergraphs by Zhu in 1992. Hajiabolhassan and Meunier (2016) introduced the first nontrivial lower bound for the chromatic number of categorical product of general Kneser hypergraphs and using this lower bound, they verified Zhu's conjecture for some families of hypergraphs. In this paper, we shall present some colorful t…

Transversals in generalized Latin squares

We are seeking a sufficient condition that forces a transversal in a generalized Latin square. A generalized Latin square of order $n$ is equivalent to a proper edge-coloring of $K_{n,n}$. A transversal corresponds to a multicolored perfect matching. Akbari and Alipour defined $l(n)$ as the least integer such that every properly edge-colored $K_{n,n}$, which contains at least $l(n)$ different colors, admits a multicolored perfect matching. They conjectured that $l(n)\leq n^2/2$ if $n$ is large enough. In this note we prove that $l(n)$ is bounded from above by $0.75n^2$ if $n>1$. We point out a…

Finding unavoidable colorful patterns in multicolored graphs

We provide multicolored and infinite generalizations for a Ramsey-type problem raised by Bollobás, concerning colorings of $K_n$ where each color is well-represented. Let $χ$ be a coloring of the edges of a complete graph on $n$ vertices into $r$ colors. We call $χ$ $\varepsilon$-balanced if all color classes have $\varepsilon$ fraction of the edges. Fix some graph $H$, together with an $r$-coloring of its edges. Consider the smallest natural number $R_\varepsilon^r(H)$ such that for all $n\geq R_\varepsilon^r(H)$, all $\varepsilon$-balanced colorings $χ$ of $K_n$ contain a subgraph isomorphic…

3 - 稳定克内泽尔图的色数

The chromatic number of 3-stable Kneser graphs

研究3 - 稳定克内泽尔图的色数，证明了梅尼耶猜想在\(s = 3\)且\(n\)足够大或\(k = s = 3\)时成立，通过证明\(s\) - 稳定集的希尔顿 - 米尔纳定理版本及采用拓扑方法实现。

关于色临界图的多色Turán猜想

On the multicolor Turán conjecture for color-critical graphs

本文通过结合稳定性论证与新型图打包技术，证明了色临界图的多色Turán猜想在更广的k值范围内成立，显著改进了先前结果。