Colin Geniet, Merge-width
Room B332 IBS (기초과학연구원)This talk is an introduction to the recent notion of merge-width, proposed by Jan Dreier and Szymon Torúnczyk. I will give an overview of the context and motivations for merge-width, …
10 events found.
Seminars and Colloquiums
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Tony Huynh, Rainbow triangles and the Erdős-Hajnal problem in projective geometries
Room B332 IBS (기초과학연구원)We formulate a geometric version of the Erdős-Hajnal conjecture that applies to finite projective geometries rather than graphs. In fact, we give a natural extension of the 'multicoloured' version of …
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Chien-Chung Huang, Robust Sparsification for Matroid Intersection with Applications
Room B332 IBS (기초과학연구원)The matroid intersection problem is a fundamental problem in combinatorial optimization. In this problem we are given two matroids and the goal is to find the largest common independent set …
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Sang-il Oum (엄상일), The Erdős-Pósa property for circle graphs as vertex-minors
Room B332 IBS (기초과학연구원)We prove that for any circle graph $H$ with at least one edge and for any positive integer $k$, there exists an integer $t=t(k,H)$ so that every graph $G$ either …
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Zhifei Yan, A Rainbow version of Lehel’s conjecture
Room B332 IBS (기초과학연구원)Lehel's conjecture states that every 2-edge-colouring of the complete graph $K_n$ admits a partition of its vertices into two monochromatic cycles. This was proven for sufficiently large n by Luczak, …
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Katherine Perry, Symmetry breaking in trees
Room B332 IBS (기초과학연구원)We will discuss two symmetry breaking parameters: distinguishing number and fixing number. Despite being introduced independently, they share meaningful connections. In particular, we show that if a tree is 2-distinguishable …
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Mujin Choi (최무진), Excluding ladder and wheel as induced minor in graphs without induced stars
Room B332 IBS (기초과학연구원)We prove that for all positive integers $k$ and $d$, the class of $K_{1,d}$-free graphs not containing the $k$-ladder or the $k$-wheel as an induced minor has a bounded tree-independence …
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Rong Luo, Modulo flows and Integer flows of signed graphs
Room B332 IBS (기초과학연구원)Nowhere-zero flows of unsigned graphs were introduced by Tutte in 1954 as a dual problem to vertex-coloring of (unsigned) planar graphs. The definition of nowhere-zero flows on signed graphs naturally …
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Marcelo Sales, On the Ramsey number of Daisies and other hypergraphs
Room B332 IBS (기초과학연구원)Given a $k$-uniform hypergraph $H$, the Ramsey number $R(H;q)$ is the smallest integer $N$ such that any $q$-coloring of the edges of the complete $k$-uniform hypergraph on $N$ vertices contains …
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Ilkyoo Choi (최일규), An improved lower bound on the number of edges in list critical graphs via DP coloring
Room B332 IBS (기초과학연구원)A graph $G$ is (list, DP) $k$-critical if the (list, DP) chromatic number is $k$ but for every proper subgraph $G'$ of $G$, the (list, DP) chromatic number of $G'$ …