Felix Finster is Full Professor of Mathematics at the University of Regensburg. Following postdoctoral research at Harvard University, he was a member of the Max Planck Institute for Mathematics in the Sciences in Leipzig for four years. He has been at the University of Regensburg since 2002 and works on general relativity and quantum field theory. Sebastian Kindermann is currently a teacher at the Comenius Gymnasium in Deggendorf, Germany. He studied physics and mathematics at the University of Regensburg, completing his master's degree in 2020. Jan-Hendrik Treude wrote his PhD thesis at the University of Regensburg, graduating in 2015. Currently, he is Fachbereichsreferent (manager of department) of the Department of Mathematics and Statistics at the University of Konstanz, Germany.

• How to use this book; Part I. Physical and Mathematical Background: 1. Physical preliminaries; 2. Mathematical preliminaries; 3. Elements of operator theory; 4. Spinors in curved spacetime; Part II. Causal Fermion Systems: Fundamental Structures: 5. A brief introduction to causal fermion systems; 6. Causal variational principles; 7. The Euler-Lagrange equations; 8. The linearized field equations; 9. Surface layer integrals and conservation laws; 10. Positive functionals; 11. Topological and geometric structures; Part III. Mathematical Methods and Analytic Constructions: 12. Measure-theoretic methods; 13. Methods of hyperbolic partial differential equations; 14. Energy methods for the linearized field equations; 15. Functional analytic methods in spacetime; 16. Fourier methods; 17. Methods of scattering theory; 18. Methods of perturbation theory; 19. Methods of microlocal analysis; Part IV. Applications and Outlook: 20. A few explicit examples of causal variational principles; 21. Basics on the continuum limit; 22. Connection to quantum field theory; Appendix. The spin coefficients; References; Notation index – in order of appearance; Notation index – thematic order; Subject index.

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