Jeez man, I mean what one always means when saying event horizon in the context of black holes: the surface that separates causally disconnected inner region ar

Jeez man, I mean what one always means when saying event horizon in the context of black holes: the surface that separates causally disconnected inner region around very compact objects from the rest of the universe. Now, the term "black hole" is admittedly from after Einstein died, but since he what he actually didn't believe was anything physical could be compact enough to have a size comparable to its Schwarzschild radius this is simply a difference in naming: clearly we are talking about the same sort of object. The math does little difference to the discussion, but if you want it then I suggest you find a book like Wald or Shutz.