Three quick recipes with fully extended oriented 2d TQFTs
arXiv:2007.07215
Abstract
It always happens: you have a talk for dinner and nothing prepared. Your signature dish never fails, but you have served it too many times already and you'd like to surprise your guests with something new. Try these quick, light and colourful reinterpretations of haute cuisine classics, like (nonabelian) Fourier transforms and the Plancherel theorem for finite groups.
Notes for a talk to be given somewhere. v4: a little more material added on group characters