01-12-2015 : M. Sozio (INFRES - TelecomParisTech), Finding dense subgraphs and interesting events in social networks

17-11-2015 : Victor Chepoi (LIF (Marseille)), Colouring hyperplanes of CAT(0) cube complexes

22-09-2015 : R. R. del Vecchio (Department of Mathematics, federal Fluminense University, Rio de Janeiro, Brasil), Laplacian Integrality in P4-Sparse Graphs