The meeting take place on MS Teams. Link is sent out to the participants shortly before the meeting. We roughly follow this plan .
Upcoming meetings:
April 26 14:00-15:00 Konrad Wróbel, Stability, cohomology vanishing, and non-approximable groups
Past meetings:
April 12 14:00-15:00 Mikołaj Frączyk (UJ), Expanders with coefficients in symmetric groups
Mar 22 14:00-15:00 Mikołaj Frączyk (UJ), Expanders with coefficients in symmetric groups
Mar 8 14:00-15:00 Piotr Nowak (IMPAN), Dymara-Januszkiewicz methods II
Feb 9 11:00-12:00 Piotr Nowak (IMPAN), Dymara-Januszkiewicz methods
Feb 2 11:00-12:00 Roman Sauer (KIT), Higher property (T) non-uniform case
Jan 26 11:00-12:00 Antonio Lopez (IMPAN), Higher property (T) Shalom's trick (notes)
Jan 19 11:00-12:00 Antonio Lopez (IMPAN), Higher property (T) for co-compact lattices (ultra product+ Shapiro) (notes)
Jan 12 11:00-12:00 Martin Nitsche (KIT), Garland's criterion following Ballmann and Świątkowski II + Mikołaj Frączyk (UJ) Matsushima's criterion
Jan 5, 11:00-12:00 Martin Nitsche (KIT), Garland's criterion following Ballmann and Świątkowski (notes)
Dec 15, 11:00-12:00 Mikolaj Fraczyk (UJ), Minimal submanifolds in locally symmetric spaces
Dec 8, 11:00-12:00 Roman Sauer (KIT) From topological expansion to Gromov overlapping property (notes)
Dec 1 - no meeting
Nov 24, 11:00-12:00 Piotr Mizerka (IMPAN) Local to global principle for topological higher expansion (part 2 notes)
Nov 17, 11:00-12:00 Piotr Mizerka (IMPAN) Local to global principle for topological higher expansion (part 1 notes)
Nov 10, 11:00-12:00 Konrad Wrobel (UJ) Local to global principle for spectral expansion (notes)
Nov 3, 11:00-12:00 Mikolaj Fraczyk (UJ) Weighted complexes and topological higher expanders (notes)
Oct 27 11:00-12:00 Mikolaj Fraczyk (UJ) Recap on ordinary expanders