Next Colloquium will take place on Tuesday, 20th April at 1:30 pm on Teams. We are glad to welcome the CELLO team, with presentations given by our colleagues Hans van Ditmarsch, Marta Gawek and Mo Liu. Program and abstracts: 13:30 - 14:00 speaker: Hans van Ditmarsch, CELLO @ LORIA title: Knowledge and simplicial complexes abstract: Simplicial complexes are a versatile and convenient paradigm on which to build all the tools and techniques of the logic of knowledge, on the assumption…