Feynman & Hibbs was a joy. Physics rather than mathematics, but very enjoyable. If it wasn't because it's a text introducing a somewhat niche approach to quant

Feynman & Hibbs was a joy. Physics rather than mathematics, but very enjoyable. If it wasn't because it's a text introducing a somewhat niche approach to quantum mechanics that didn't gain broad traction, this book would totally have been the Kernighan & Ritchie of quantum mechanics.