All seminars take place in Lecture Room M2 (Department of Mathematics) in hybrid format.
Email hopega@math.auth.gr if you like to join the mailing list and receive seminar announcements.
(every Monday, 10 am - 1 pm, M2/online)
Organizers: Ch. Psaroudakis, G. Raptis
The Algebra & Topology Seminar will feature research talks by invited speakers and members of the group, as well as a seminar series devoted to the theory of stable infinity-categories and its applications.
05/10 10-12 pm V. Patzalis (AUTh) Seminar on stable ∞-categories: Introduction and Overview (program)
12/10 10-12 pm V. Patzalis (AUTh) Stable ∞-categories (1): Stability
19/10 10-12 pm Ch. Psaroudakis (AUTh) Stable ∞-categories (2): Exactness
12 - 1 pm A. Hayash (AUTh) What is Cartier duality?
26/10 No seminar (Holiday)
02/11
09/11
16/11
23/11
30/11
07/12
21/12 10-11 am L. Moser (University of Hamburg) tba
(every Friday, 3 pm - 6 pm, M2/online)
Organizer: G. Raptis
The Topology & Geometry Seminar will feature research talks by invited speakers and members of the group, as well as a seminar series devoted to the interactions between manifold topology and algebraic K-theory.
09/10 3-6 pm G. Raptis (AUTh) SK-groups, SK-invariants and the additivity of the signature
16/10 3-6 pm M. Maridakis (AUTh) Handle presentations and applications [postponed]
23/10 3-5 pm M. Maridakis (AUTh) Handle presentations and applications
5-6 pm C. Campagnolo (UA Madrid) A vanishing criterion for bounded cohomology
Abstract. Bounded cohomology is an invariant of groups and spaces first introduced by Johnson in the 70s in the context of Banach algebras, and then mightily developed by Gromov in the 80s. Since then, it has been widely studied and proved useful in several areas, from geometry and topology to group theory. Its vanishing and non-vanishing depending on the family of coefficients under consideration allows one to characterize, for instance, finite, amenable, and Gromov hyperbolic groups. I will explain a purely algebraic vanishing criterion obtained in joint work with F. Fournier-Facio, Y. Lodha and M. Moraschini for a big family of coefficients. It applies to many different types of groups, of geometric, topological and algebraic origin.
30/10 3-5 pm
5-6 pm V. Patzalis (AUTh) tba
06/11 3-5 pm I. Gkeneralis (AUTh) tba
5-6 pm J. Semikina (University of Lille) tba
13/11
20/11
27/11
04/12
11/12
18/12
Workshop: Algebra & Geometry Days in Thessaloniki, 14-15 December 2026