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Feb19-12, 10:41 AM
P: 1,555
Quote Quote by Nabeshin View Post
If we imagine a hole of mass M, and throwing in some small mass dm, the event horizon smoothly expands from its radius at r=2M to r=2(M+dm) as the mass falls in.
I do not think that is correct.

The total mass will be slightly less than M+dm.