Susskind is an active professor and author. His work is under copyright. While shadow libraries (like Library Genesis or Z-Library) often host these files, accessing them may be illegal in your jurisdiction, and it deprives the authors who worked for years to create this clarity. Furthermore, PDFs found on random websites are often riddled with OCR errors (garbage equations), missing pages, or malware.
: Practical applications including the Schwarzschild solution and the physics of gravitational radiation. Series Context the theoretical minimum general relativity pdf
: It introduces the advanced math required to speak the language of physics—including tensors (covariant and contravariant), metric tensors, and non-Euclidean geometry. Susskind is an active professor and author