The next informal seminar will be given by our own Patrick Weber. His title is *“From complex to hypercomplex cohomologies”*. The talk will take place at 2pm in the Salle de Profs (9th floor of building NO). The abstract is below.

We first review some cohomological aspects of complex (non-Kähler) manifolds such as Bott-Chern cohomology, the d-dbar-Lemma and the Frölicher spectral sequence. We then show how to apply these concepts to hypercomplex manifolds, that is manifolds endowed with three integrable almost-complex structures satisfying the quaternionic relations.