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The Schwarzschild Solution and the Black Hole
The Einstein's theory was 10, what we call 10 couple nonlinear possible differential equations. So you're lucky when you get one solution and the black hole solution or the Schwarzschild solution. But at that time, like people, some people on one of my mentors, David Finkelstein, of the Eddington Finkelstein coordinates, which was based on Schwarzschild solution about the event horizon. You know, this was seen by many to just be some mathematical trickery, some mathematical solution that has not no element of reality until, of course, we found one.