Non-invertible symmetries in Non-Linear Sigma Models
IFT Seminar Room/Red Room Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, SpainBy this point it is fairly well known that symmetries can be generalised in many ways including the case where the topological operator that generates the symmetry does not have an inverse.