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What's to be done about a wrong answer that is not edited or deleted? [duplicate]

Federico Fallucca's answer here contains an error Set of branch points isn't discrete, but branch points are isolated? as pointed out by Moishe Kohan what is written about branch points is plain ...
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Is CRUDE healthy?

The chatroom CRUDE stands for Close, Reopen, Undelete, Delete, Edit. Is the way this room is currently used healthy for Maths Stack Exchange? There is a core of users which can be counted on one ...
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Are we too trigger-happy about deleting (relatively) new posts?

I was directed just now to a post with the following abbreviated time-line: Question was posted 21 hours ago Question was closed as "unclear what you are asking" 19 hours ago Question was deleted by ...
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Sorry, this was most probably asked before in some form, but I haven't managed to find the original. Let me describe a hypothetical situation related to this question. User $A$ posts a simple ...
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Is it right to delete a downvoted answer of one's own? I have only done this once (I actually got the "Peer pressure" badge from that), but I am afraid that this is not allowed. I do have an accepted ...
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Is sometimes keeping wrong answer reasonable?

My memory might be fooling me, but I believe I have seen comments or discussions an meta regarding this matter. I am unable to find it now, so I will ask about your opinion. If I answer some question ...
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This is extremely annoying that people give incorrect answers in the comments. I can't downvote comments, so I can't easily signal that the comment is wrong. If there are already several comments on ...
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I saw recent thread on whether incorrect answers should be deleted. What about answers that are "not even wrong", because they use notation in ways that simply make no sense? I'm thinking about two of ...
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Assume someone asks a question, I read it and think "ok I've got it". And post my answer. After some amount of time I realize, or am alerted that my answer is wrong. Perhaps it was too sloppy, or ...
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A case for deleting wrong answers

Yesterday I observed (on my cellphone) that Google returned a top-level "snippet" for graph isomorphism that quoted this old (and incorrect) Answer. Normally I do ...
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Deletion of on-topic answers only because they contain mathematical errors.

Are mathematical errors in an answer that is otherwise reasonable and on-topic ever a sufficient reason for users (other than the answer-author) to delete that answer? For a recent answer, the ...
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What to do with blatantly false answers?

Recently, I came across this answer to an old question, which attempts to prove Fermat's Last Theorem (edit: the answer has now been deleted). It takes almost no effort to see why the argument there ...
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[Edit: to explain some things that were not so clear in the original post] I believe in being straightforward. Without linking to the specific question, people will just treat this as another vague ...