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With enough reputation points you can edit other people's questions and answers. My question is: When is this practice appropriate?
I can see it being fine if all you're doing is fixing a typo (mathematical or otherwise) or righting some kind of minor oversight. But is it also acceptable to significantly change or expand the original post so as to make it -- at least in your opinion -- clearer or more comprehensible?
I'm asking partly out of sheer curiosity and partly because my answer to this question was edited today. I'm not particularly annoyed by this edit (which I have nonetheless rolled back), but I was taken aback by it. (It also introduced a minor error: the hypothesis "connected" was missing from the first assertion, which also propagated later when it was claimed that "$X$ must be a point.") So I'd like to see what the community's standpoint is in regards to edits of this type.
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