# Feynman Least Action Thesis

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## Full Title

The Principle of Least Action in Quantum Mechanics^{[1]} was Feynman's 1942 PhD thesis.

## Context

This thesis introduced the ideas that came to be known as the [https://en.m.wikipedia.org/wiki/Wheeler%E2%80%93Feynman_absorber_theory Wheeler–Feynman absorber theory (also called the Wheeler–Feynman time-symmetric theory) ]derived from the assumption that the solutions of the electromagnetic field equations must be invariant under time-reversal transformation, as are the field equations themselves. Indeed, there is no apparent reason for the time-reversal symmetry breaking, Maxwell's equations and the equations for electromagnetic waves have, in general, two possible solutions: a retarded (delayed) solution and an advanced one.

## References

- ↑ Richard P. Feynman,
*The Principle of Least Action in Quantum Mechanics*, Princeton University 1942, reprinted in*Feynman's Thesis*, Ed Laurie M. Brown, 2005 ISBN 9789812563804

### Other Material

- See wiki page on the Eventful Universe
- You Tube Video for novices.