Voiculescu’s online seminar on probabilistic operator algebra is running again, for the spring term, but now with a different time; it’s not on Mondays anymore, but on Tuesdays. For more info and details about the upcoming talks, see here. In particular, to get the zoom links for the talks, one should write to Jorge (jgarzav_at_caltech_dot_edu).

Actually, the next talk, on January 30 at 10:30 a.m. Pacific time (which is 7:30 p.m. German time), will be given by myself. It will be on Bi-free probability and reflection positivity and is based on my small note on the arXiv. Most of the talk will be about my (not very deep) understanding of the notion of reflection positivity, which has quite some relevance in quantum field theory and statistical physics. It seems to me that in the bi-free extension of free probability, we have a canonical candidate for a reflection, namely the exchange between the two (left and right) faces and it might be worth to investigate positivity questions in this context.