An Approach to the Selberg Trace Formula via the Selberg Zeta Function The Notes give a direct approach to the Selberg zeta function for cofinite discrete subgroups of SL (2 #3) acting on the upper half plane. The basic idea is to compute the trace of the iterated resolvent kernel of the hyperbolic Laplacian in order to arrive at the logarithmic derivative of the Selberg zeta function. Previous knowledge of the Selberg trace formula is not assumed. The theory is developed for arbitrary real weights and for arbitrary multiplier systems permitting an approach to known results on classical automorphic forms without the Riemann Roch theorem. The authors discussion of the Selberg trace formula stresses the analogy with the Riemann zeta function. For example the canonical factorization theorem involves an analogue of the Euler constant. Finally the general Selberg trace formula is deduced easily from the properties of the Selberg zeta function: this is similar to the procedure in analytic number theory where the explicit formulae are deduced from the properties of the Riemann zeta function. Apart from the basic spectral theory of the Laplacian for cofinite groups the book is self contained and will be useful as a quick approach to the Selberg zeta function and the Selberg trace formula