| Thursday 25 April 2024 | |
| Events for day: Wednesday 13 April 2022 |
| 14:00 - 15:00 Combinatorics and Computing Weekly Seminar Tverberg's Theorem with Constraints School MATHEMATICS This is a report on a joint project with Mr. Abolfazl Najafian. We will study the connectivity of a simplicial complex associated to all partial vertex colorings of a graph. More specifically given a graph G and an integer n we define a simplicial complex E_n(G) whose vertices are V(G)x{1,2,...,n} and whose faces are all partial colorings of vertices using the colors {1,...,n}. Then we see under what conditions this graph is n-2 connected. The relation between this problem and the chromatic number of stable and semi-stable Kneser hyper-graphs and also the Tverberg's problem with constraints will be explained. To get more informat ... 16:30 - 18:30 Mathematical Logic Weekly Seminar Monadic Dividing Lines and Hereditary Classes School MATHEMATICS A theory T is monadically NIP if every expansion of T by unary predicates is NIP. We will discuss how monadic NIP manifests in the theory T itself rather than just in unary expansions, and how this can be used to produce structure or non-structure in hereditary classes. Analogous results concerning monadic stability will also be discussed. Zoom info: https://us06web.zoom.us/j/86380285511?pwd=Z2puU2w0NzIwL3doM1ljcCtBdHFFdz09 Meeting ID: 863 8028 5511 Passcode: 362880 ... |