기초과학연구원 이산수학그룹
On December 9, 2020, Karl Heuer from Technische Universität Berlin gave an online talk on the problem of detecting even directed circuits in a regular oriented matroid and related classes of oriented matroids at the Virtual Discrete Math Colloquium. The title of his talk was “Even Circuits in Oriented Matroids“.
On December 8, 2020, Hong Liu from University of Warwick presented a talk on his recent work with Richard Montgomery, answering the odd cycle problem of Erdős and Hajnal (1981). The title of his talk is “A solution to Erdős and Hajnal’s odd cycle problem“.
On December 3, 2020, Deniz Sarikaya from Universität Hamburg gave an online talk about necessary conditions for locally finite graphs to have a Hamiltonian cycle in terms of their forbidden induced subgraphs. The title of his talk was “What means Hamiltonicity for infinite graphs and how to force it via forbidden induced subgraphs“.
On November 30 and December 2, 2020, Joonkyung Lee (이준경) from University College London gave two online talks on the Ramsey multiplicity and common graphs at the Discrete Math Seminar organized by Jaehoon Kim at KAIST. The titles of his talks are “On Ramsey multiplicity” and “On common graphs“.
(The photo above was taken earlier in his other seminar talk.)
On December 1, 2020, Debsoumya Chakraborti from the IBS Discrete Mathematics Group presented his theorem with Po-Shen Loh about the existence of a rainbow matching of size q in a simple graph whose edges are colored properly by 2q+o(q) colors. The title of his talk was “Rainbow matchings in edge-colored simple graphs“.
On November 24, 2020, Duksang Lee (이덕상) from KAIST and the IBS Discrete Mathematics Group gave a talk on the characterization of matroids whose bases form graphic delta-matroids at the Discrete Math Seminar. The title of his talk was “Characterizing matroids whose bases form graphic delta-matroids“.
On November 19, 2020, Yijia Chen (陈翌佳) from Fudan University spoke at the Virtual Discrete Math Colloquium on the shrub-depth of graph classes. The title of his talk is “Graphs of bounded shrub-depth, through a logic lens“.
The IBS Discrete Mathematics Group had its first “DIMAG internal workshop” at Jeonju Lahan Hotel located in Jeonju Hanok Village on November 16-18, 2020. Participants include almost all current members of DIMAG and Jaehoon Kim from KAIST, and Hong Liu from University of Warwick. Every participant had a chance to present their current research problems informally.
On November 11, 2020, Meike Hatzel from Technische Universität Berlin gave an online talk on the existence of a bramble of small order and small size in a graph of tree-width k at the Virtual Discrete Math Colloquium. The title of her talk was “Constant congestion bramble“.
On November 10, 2020, Casey Tompkins from the IBS Discrete Mathematics Group presented a talk on the extremal problems on Boolean and linear lattices with forbidden posets at the Discrete Math Seminar. The title of his talk was “Extremal forbidden poset problems in Boolean and linear lattices“.