Explore the advanced mathematical concepts presented in this lecture on the spectral theory of stationary spacetimes. Delve into the second part of Alexander Strohmaier's talk, which was delivered as part of the Thematic Programme on "Spectral Theory and Mathematical Relativity" at the Erwin Schrödinger International Institute for Mathematics and Physics (ESI). Over the course of 66 minutes, gain insights into the intricate relationship between spectral theory and mathematical relativity, with a specific focus on stationary spacetimes. Enhance your understanding of these complex topics in theoretical physics and mathematics through this in-depth presentation by a leading expert in the field.