Segnalo minicorso in topologia presso il nostro dipartimento (on line) Bruno

---------- Forwarded message --------- From: Coordinatore del dottorato in matematica coord_mat@dm.unipi.it Date: Sat, Oct 2, 2021 at 9:14 PM Subject: [Utenti] annuncio minicorso: "Combinatorial topology and group theory" / riunione preliminare To: mailing list dottorandi dottorandi@mail.dm.unipi.it, utenti@dm.unipi.it utenti@dm.unipi.it Cc: Giovanni Paolini paolini@caltech.edu

Buonasera,

nel mese di novembre Giovanni Paolini (Caltech) terrà un mini-corso di 5 lezioni dal titolo

Combinatorial topology and group theory

(vedere sotto per maggiori dettagli). Il corso sarà tenuto online. La riunione preliminare sarà

il 4 novembre 2021, ore 17 – 18,

su Google Meet: https://meet.google.com/fgj-yduu-kpf

Giovanni Alberti

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Titolo: Combinatorial topology and group theory

Abstract: In this course, we will cover combinatorial techniques to study topological spaces and groups. On the topological side, we are going to see how discrete Morse theory can be used to prove homotopical and homological statements through the language of partially ordered sets (posets). On the group-theoretic side, we are going to introduce Garside theory and apply it to the study of symmetric groups and braid groups (as well as their generalizations, Coxeter and Artin groups). Using discrete Morse theory, we will prove one of the main results of Garside theory, namely the construction of a classifying space (or K(π,1)) for an arbitrary Garside group. We will also mention algorithmic aspects in discrete Morse theory (related to collapsibility) and in Garside theory (the word problem). If time permits, we will also touch on current research directions in the theory of Garside groups, Coxeter groups, and Artin groups.

Prerequisiti: Basic algebraic topology and homological algebra (e.g., the UniPi courses "Elementi di topologia algebrica" and "Istituzioni di algebra"). Emanuele Delucchi's course on "Combinatorial methods in topology" (Spring 2021) is not a requirement but will be useful.

Programma provvisorio in 5 lezioni: 1. Partially ordered sets and relevant examples 2. Topological discrete Morse theory, applications and algorithms 3. Algebraic discrete Morse theory 4. Combinatorial Garside structures, the word problem, and examples (symmetric groups and braid groups) 5. Classifying spaces of Garside groups and consequences