Special Relativity And Classical Field Theory by Leonard Susskind

The Theoretical Minimum

A concise, accessible introduction to spacetime geometry and Lorentz invariance that builds the tools of four-vectors and tensors, develops the covariant formulation of electromagnetism, and uses the action principle and Lagrangian densities to derive classical field equations. It emphasizes symmetries and Noether’s theorem, constructs the energy-momentum tensor, and explores gauge invariance and the structure of Maxwell’s equations, with clear examples and exercises that prepare readers for more advanced study, including quantum field theory.