The Coalgebra Day is an annual informal meeting of researchers in coalgebra between academic institutions in the Netherlands. This years meeting is held in Amsterdam and organised by Yde Venema, Vincenzo Ciancia, and Raul Leal.

At this meeting I will give a talk on my recent work on infinite trace semantics of coaglebras with branching and transition type. The work extends my previous work with Alexander Kurz on generic trace logics and generalises previous work of Bart Jacobs on trace semantics of coalgebras.

On 27th February I will give an invited seminar in the TQFT study group at the University of Warsaw, in which I will discuss a construction of a 3-dimensional topological quantum field theory (3D-TQFT) in terms of modular functors, from which we obtain a theory of quantum invariants of 3-manifolds with embedded banded links.

On 07 September 2009 I have delivered a talk at CALCO on my work with Yde Venema on the complementation of coalgebra automata from my visit last year. Our paper is available, as well as the slides. I would like to hear your opinion, questions, and comments : email(at)christiankissig.de !