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.