Physics 582 Fall 2020 (QFT I) zoom lecture on Wednesday November 4, 2020. today we covered path integrals for fermions sing fermion coherent states with Grassmann fields and used it to derive the path integral for the Dirac theory both in Minkowski and in Euclidean spacetimes. We also discussed the zeta function approach to the computation of functional determinants and computed the determinant of the Euclidean Klein-Gordon operator.