Delay Equations of the Wheeler-Feynman Type
  We present an approximate model of Wheeler-Feynman electrodynamics for which uniqueness of solutions is proved. It is simple enough to be instructive but close enough to Wheeler-Feynman electrodynamics such that we can discuss its natural type of initial data, constants of motion and stable orbits with regard to Wheeler-Feynman electrodynamics. 
D.-A. Deckert, D. D\"urr, N. Vona
math-ph hep-th math.DS math.MP