Citations of:
Mie's Theories of Matter and Gravitation
In Jürgen Renn (ed.), The Genesis of General Relativity. Boston: Springer. pp. 15431553 (2007)
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We show that in the Maxwell–Lorentz theory of classical electrodynamics most initial values for fields and particles lead to an illdefined dynamics, as they exhibit singularities or discontinuities along lightcones. This phenomenon suggests that the Maxwell equations and the Lorentz force law ought rather to be read as a system of delay differential equations, that is, differential equations that relate a function and its derivatives at different times. This mathematical reformulation, however, leads to physical and philosophical consequences for the ontological (...) 

Recent work on the history of General Relativity by Renn, Sauer, Janssen et al. shows that Einstein found his field equations partly by a physical strategy including the Newtonian limit, the electromagnetic analogy, and energy conservation. Such themes are similar to those later used by particle physicists. How do Einstein's physical strategy and the particle physics derivations compare? What energymomentum complex did he use and why? Did Einstein tie conservation to symmetries, and if so, to which? How did his work (...) 