There are some questions which are answered quite well by a nearly-identical question on another site (say, computer science's stack exchange, or math overflow). Should those questions get answers just pointing towards those other sites? Should those questions be closed? etc.
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2$\begingroup$ Related: Closing questions as off topic if they have an answer on mathoverflow?. My personal preference is to write a more accessible version of the answer from the other site. For example, I tried this here, which made sense because the MO answer was too terse for the OP to digest. (Though it's not clear if the OP benefited: he did not revisit MSE after my answer.) $\endgroup$– Post No BullsDec 26, 2013 at 6:54
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$\begingroup$ Related: Questions x-posted and answered on MO $\endgroup$– Grigory MDec 26, 2013 at 7:43
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$\begingroup$ Both of those questions seem basically related to my question, but have about three different answers among them... $\endgroup$– Mark S.Dec 27, 2013 at 2:49
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1$\begingroup$ For the ones that should be closed, the software will sometimes not allow for closing as an off-site duplicate. In these cases, it is necessary to use the custom close reason, which is available under Close -> Off Topic -> Other, and leave a message explaining the reason for voting to close. This is the general method for voting to close when the software does not have a specific reason for the situation at hand. $\endgroup$– Carl MummertSep 3, 2016 at 17:27
1 Answer
Post No Bulls answered this in a Comment, and I'm promoting it to an Answer of the Community Wiki persuasion:
Related: Closing questions as off topic if they have an answer on mathoverflow?. My personal preference is to write a more accessible version of the answer from the other site. For example, I tried this here, which made sense because the MO answer was too terse for the OP to digest. (Though it's not clear if the OP benefited: he did not revisit MSE after my answer.)