I am looking at some older questions that are left unanswered, and I see some examples where the question is well and fully answered in the comments. Is it all right for me to basically copy/paste or recompose the comments into an answer (and mention that it is composed as such)?

For example: Does every NP problem have a poly-sized ILP formulation?

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1 Answer 1

Yes, please do so. It's better to have answers clearly visible and posted as such.

All user content on Stack Exchange, including comments, is licensed under CC BY-SA, so it's ok to copy-paste it as long as you attribute it to the original author. From an ethical point of view, also, it's ok to copy someone else's content as long as you attribute it.

If you're just copying the content without contributing anything original, you may want to make your answer community wiki. If you expand an elliptic comment into a more detailed explanation of the same idea, don't use community wiki: your wording is your own.

See also How to handle questions which are answered in the comments? and many duplicates on the main meta site.

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