On January 19, 2023, Pedro Montealegre from Universidad Adolfo Ibáñez gave an online talk at the Virtual Discrete Math Colloquium on a proof labeling scheme certifying that a graph has tree-width at most k and satisfies a monadic second-order property with a certificate of small size at each vertex. The title of his talk was “A Meta-Theorem for Distributed Certification“.
On January 17, 2023, Noleen Köhler from the LAMSADE, CNRS gave a talk at the Discrete Math Seminar on classes of graphs on which the first order model checking is FPT on its subclass if and only if the twin-width is bounded. The title of her talk was “Twin-Width VIII: Delineation and Win-Wins“.
On January 10, 2023, Mamadou Moustapha Kanté from the Université Clermont Auvergne gave a talk at the Discrete Math Seminar on the recognizability and the MSO definability for classes of matroids of bounded path-width having the strongly pigeonhole property. The title of his talk was “MSOL-Definable decompositions“.
On January 3, 2023, Youngho Yoo from Texas A&M University gave a talk at the Discrete Math Seminar on the approximation algorithm for the traveling salesman problem on cubic graphs by showing an upper bound on the length of a shortest closed spanning walk in a simple 2-connected subcubic graph. The title of his talk was “Approximating TSP walks in subcubic graphs“.
On January 2, 2023, Debsoumya Chakraborti from the IBS Discrete Mathematics Group received the 2022 Outstanding Researcher Award (우수연구원상) from the IBS president. In addition, Mia Oh (오미아), one of our staff, received the 2022 Outstanding Staff Award (우수직원상) from the IBS president. Congratulations!
On December 28, 2022, Stijn Cambie from the IBS Extremal Combinatorics and Probability Group gave a talk at the Discrete Math Seminar on various problems on the number of independent sets, including the problem of finding a graph with a given number of independent sets of fixed size. The title of his talk was “The 69-conjecture and more surprises on the number of independent sets“.