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 (...) 

I describe how relativistic field theory generalizes the paradigm property of material systems, the possession of mass, to the requirement that they have a mass–energy–momentum density tensor T µ associated with them. I argue that T µ does not represent an intrinsic property of matter. For it will become evident that the definition of T µ depends on the metric field g µ in a variety of ways. Accordingly, since g µ represents the geometry of spacetime itself, the properties of (...) 

This is the chapter on general relativity for the Cambridge Companion to Einstein which I am coediting with Christoph Lehner. 