Michler Lecture

Julie BergnerThe University of Virginia
2-Segal structures and the Waldhausen S-construction

Thursday, October 18, 2018 - 4:00pm
Malott 532

Abstract: The structure of a 2-Segal space was defined by Dyckerhoff and Kapranov and independently by Galvez-Carrillo, Kock, and Tonks under the name of decomposition space. Both groups found many examples in algebra, topology, and combinatorics, yet a common one was the output of Waldhausen's S-construction when applied to an exact category. In joint work with Osorno, Ozornova, Rovelli, and Scheimbauer, we give a more general version of this construction so that every 2-Segal space arises from it.

Reception at 3:30pm in 532 Malott Hall - If you need any special accommodations (e.g., dietary constraints, mobility constraints, etc.), please contact Heather Peterson at hko1@cornell.edu