@user21820 it's funny that you mentioned those answers because the other day I was looking for a proof of that limit and then I found that question. IIRC, I downvoted like ten of the answers given xd
And as I said before, I still can't vote to delete wrong (utterly wrong) answers.
@user170039 I was not clear enough; I meant "doubt that Robert Israel gave an answer to my interpretation of the question". I can accept if you doubt my interpretation, especially if you do not understand the answer. For what it's worth, the poster of the other answer that I said was wrong also agreed with me. In any case, if you do not understand the answer, you're free to ask in a comment to clarify it. It's written assuming the reader has abstract algebra background.
@Xam: Thanks! Yeap some of us can vote to delete, but we can't even do it unless the score is negative. That's the main issue with the current system; it serves the general SE purpose of collecting and sharing content, but fails to ensure (objective) mathematical correctness when experts can't delete.
@SimplyBeautifulArt nothing posted from the user, currently. If they come back (if they haven't already), they'll probably register for a second (or third, or....) account.