I had made a question here asking about a result mentioned in a book I was reading whose theorem I didn't know. One of the comments gave the right name of the theorem and proof, I posted that as a self answer to my question because I thought others would find it helpful. However, my answer is now deleted.

So, if one asks for a theorem without knowing its name what is the correct approach to answering such a question? Particularly when the theorem has a standard proof which can be found on the internet.

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    $\begingroup$ Your question was "How do I prove this theorem?", yet your answer was "The name of the theorem is [x], the proof can be found at [y]." Such an answer is a kind of "link-only answer." Such answers are not terribly useful, as they tend to suffer from link-rot. A better answer would have actually given the proof. In this case, I do not think that it was in appropriate to delete your answer. $\endgroup$ – Xander Henderson Dec 17 '20 at 12:38

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