When writing a PhD thesis on mathematics one needs to quote many results by others, such as
The following theorem was proved by ABC in [1].
Theorem. Bla, bla, bla...
My question is when should one include a proof of the result in his/her PhD thesis, if it is basically the same as in the reference? I do not quite see the point of copy-pasting the proof by others. Of course if one has a completely different proof of the same result, it is probably suitable to include it.
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