Explore the intricacies of thermal form factor series for dynamical two-point functions of local operators in integrable quantum chains in this comprehensive lecture. Delve into the fascinating world of integrability in Condensed Matter Physics and Quantum Field Theory as presented by F. Goehmann from the University of Wuppertal. Gain valuable insights into the mathematical foundations and practical applications of these complex concepts, enhancing your understanding of quantum systems and their behavior at finite temperatures.