As previously formulated by Sciama, Woodward suggests that the Wheeler-Feynman absorber theory would be the correct way to understand the action of instantaneous inertial forces in Machian terms [REF].
The Wheeler-Feynman absorber theory is an interpretation of electrodynamics that starts from the idea that a solution to the electromagnetic field equations has to be symmetric with respect to time-inversion, as are the field equations themselves [REF].