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Large homogeneous subgraphs in bipartite graphs with forbidden induced subgraphs
Journal of Graph Theory ( IF 0.9 ) Pub Date : 2020-10-28 , DOI: 10.1002/jgt.22639
Maria Axenovich 1 , Casey Tompkins 1, 2 , Lea Weber 1
Affiliation  

For a bipartite graph G, let h(G) be the largest t such that either G or the bipartite complement of G contain K_{t,t}. For a class F of graphs, let h(F)= min {h(G): G\in F}. We say that a bipartite graph H is strongly acyclic if neither H nor its bipartite complement contain a cycle. By Forb(n, H) we denote a set of bipartite graphs with parts of sizes n each, that do not contain H as an induced bipartite subgraph respecting the sides. One can easily show that h(Forb(n,H))= O(n^{1-s}) for a positive s if H is not strongly acyclic. Here, we prove that h(Forb(n, H)) is linear in n for all strongly acyclic graphs except for four graphs.

中文翻译:

具有禁止诱导子图的二部图中的大型齐次子图

对于二部图 G,让 h(G) 是最大的 t,使得 G 或 G 的二部补集包含 K_{t,t}。对于 F 类图,设 h(F)= min {h(G): G\in F}。如果 H 和它的二分图都不包含环,我们就说二分图 H 是强无环的。Forb(n, H) 表示一组二部图,每个部分的大小为 n,不包含 H 作为关于边的诱导二部子图。如果 H 不是强无环的,则可以很容易地证明 h(Forb(n,H))= O(n^{1-s}) 对于正 s。在这里,我们证明 h(Forb(n, H)) 对于除四个图之外的所有强无环图在 n 中都是线性的。
更新日期:2020-10-28
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