The man who proved black holes weren’t ‘impossible’on October 6, 2020 at 2:37 pm

“And I had general arguments which were pure mathematical, topological arguments – not the kind of thing people were using. And it was this idea, which I later called a trapped surface, which is a characterisation of when your collapse had reached a point of no return, roughly speaking, but it didn’t depend on symmetry or anything like that. It was just a general characterisation that could tell you that something has gone funny.”

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