Alexander Zakharov (CMUP, Univ. Porto) 
Rightangled Artin groups: commensurability classification and subgroup intersection problem

20171213 
Nora Szakács (CMUP, Univ. Porto) 
Inverse monoids and immersions of cell complexes

20171017 
Jorge Almeida (CMUP, Univ. Porto) 
Towards a pseudoequational proof theory

20170713 
Ricardo Campos (ETH Zürich, Switzerland) 
Graph complexes and configuration spaces of points

20170419 
Tom Leinster (Univ. of Edinburgh, UK) 
Magnitude homology

20170411 