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    Lecture on “Monochromatic connected matchings, paths and cycles in 2-edge-colored multipartite graphs”
    DateandTime: 2019-08-05 19:46:55

    Lecture on “Monochromatic connected matchings, paths and cycles in 2-edge-colored multipartite graphs


    Speaker: Xujun Liu, University of Illinois at Urbana-Champaign (UIUC)

    Date: Aug. 13, 2019

    Time: 9:00 am

    Location: Lecture Hall 1032, Block B, Zhixin Building, Central Campus

    Sponsor: School of Mathematics


    Abstract:

    We solve four similar problems: For every fixed s and large n, we describe all values of n1, …, ns such that for every 2-edge-coloring of the complete s-partite graph Kn1,...,ns there exists a monochromatic (i) cycle C2n with 2n vertices, (ii) cycle C≥2n with at least 2n vertices, (iii) path P2n with 2n vertices, and (iv) path P2n+1 with 2n + 1 vertices. This implies a generalization of the conjecture by Gy′arf′as, Ruszink′o, S′ark?ozy and Szemer′edi that for every 2-edge-coloring of the complete 3-partite graph Kn,n,n there is a monochromatic path P2n+1. An important tool is our recent stability theorem on monochromatic connected matchings (A matching M in G is connected if all the edges of M are in the same component of G). We will also talk about exact Ramsey-type bounds on the sizes of monochromatic connected matchings in 2-colored multipartite graphs. Moreover, we will talk about the existence of long monochromatic paths and cycles in 2-edge-colored graphs with large minimum degree. Joint work with J′ozsef Balogh, Alexandr Kostochka and Mikhail Lavrov.


    For more information, please visit:

    http://www.math.sdu.edu.cn/info/1020/12181.htm?tdsourcetag=s_pcqq_aiomsg


    Edited by Wei Zhen








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