With Wheeler, this man names a time-symmetric alternative to conventional electromagnetism, while he used the principle of least action in his formulation of quantum mechanics.
One of this physicist's "rules" states that forming a function from noncommuting operators requires treating them as commutable, once a suitable time-ordering convention has been adopted. One can then use a "disentangling process" to restore the conventional ordering. Those "rules" allowed the development of the time-ordered perturbation series of quantum theory by Dyson. This man co-names propagators that are two-parameter analogues of Schrodinger semigroups along with (*) Kac, with whom he also names a formula for solving stochastic PDEs. With Wheeler, this man names a time-symmetric alternative to conventional electromagnetism, while he used the principle of least action in his formulation of quantum mechanics. With Schwinger and Tomonaga, this man was award a Nobel for his work on the renormalization of QED. The path integral formulation of quantum mechanics was developed by, for 10 points, what namesake of diagrams that depict particle interactions, a strip club enthusiast who delivered some famous namesake "Lectures" on physics?
One of this physicist's "rules" states that forming a function from noncommuting operators requires treating them as commutable, once a suitable time-ordering convention has been adopted.
Richard Phillips "Dick" Feynman