Abstract
Having got the quantum-mechanical equation of change of stationary states, it is rather straightforward to derive the quantum-mechanical equation of motion. As anticipated in the foregoing chapter, this is the time-dependent Schrödinger equation. Moreover, Huygens’ principle is shown to apply to QM, as obtained by Feynman in another way.
Keywords: Chapman-Kolmogorov equation, Feynman, Huygens’ principle, quantum-mechanical equation of motion, Time-dependent wave function, Timedependent Schrödinger equation.