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Special Colloquium: Measuring Combinatorial Complexity Via Regularity Lemmas

Caroline Terry (OSU)
Thursday, September 28, 2023
4:15-5:15 PM
170 Weiser Hall Map
Abstract: A major theme in combinatorics is understanding the structure of graphs with forbidden subgraphs. This can be phrased by asking, given some local combinatorial restriction in a graph, what are the global implications? Are there special local restrictions which yield very strong information about global structure? These kinds of questions are also studied in model theory, but with a focus on the infinite setting.

Many tools have been developed in combinatorics to study global structure in finite graphs. One such tool is called Szemer\'{e}di’s regularity lemma, which gives a structural decomposition for any large finite graph. Beginning with work of Alon-Fischer-Newman, Lov\'{a}sz-Szegedy, and Malliaris-Shelah, it has been shown over the last 15 years that regularity lemmas can be used to detect structural dichotomies in graphs, and that these dichotomies always have deep connections to model theory. In this talk, I present extensions of this type of result to arithmetic regularity lemmas, which are analogues of graph regularity lemmas, tailored to the study of combinatorial problems in finite groups. This work uncovered tight connections between tools from additive combinatorics, and ideas from the model theoretic study of infinite groups.

Talk will be in-person and on Zoom:
Building: Weiser Hall
Event Type: Workshop / Seminar
Tags: Mathematics
Source: Happening @ Michigan from Colloquium Series - Department of Mathematics, Department of Physics, Department of Mathematics, Michigan Center for Applied and Interdisciplinary Mathematics, MCAIM Colloquium - Department of Mathematics, Special Events - Department of Mathematics