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Questions about partial differential equations of hyperbolic type. Often used in combination with the top-level tag ap.analysis-of-pdes.

5 votes

About Dirac function

Your notion and the equality in the book are consistent, since $$ \delta (a^2 t^2 - |x|^2 ) = \frac{1}{2|at|} (\delta (at-|x|) + \delta (at+|x|) ) $$ (I suppose an assumption is being made that $at>0$ …
Michael Engelhardt's user avatar
6 votes

Does there exist an electromagnetic analogue of Einstein's field equations?

There is a profound conceptual shift between Gravitoelectromagnetism and General Relativity that cannot analogously occur between Maxwell's equations and any "???". In General Relativity, there is not …
Michael Engelhardt's user avatar