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Feynman's Path Integral Approach to Quantum Mechanics

Classical Mechanics: Lagrangian and Action → Path Integral for the Density Matrix and Statistical Mechanics

This advanced undergraduate path systematically develops Feynman's path integral formulation of quantum mechanics. Starting from the necessary classical mechanics and quantum formalism, it builds the path integral from first principles, derives the propagator, explores its connection to classical action, and applies it to key quantum systems and perturbation theory.