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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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    $\begingroup$ 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 Bulls Dec 26 '13 at 6:54
  • $\begingroup$ Related: Questions x-posted and answered on MO $\endgroup$ – Grigory M Dec 26 '13 at 7:43
  • $\begingroup$ Both of those questions seem basically related to my question, but have about three different answers among them... $\endgroup$ – Mark S. Dec 27 '13 at 2:49
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    $\begingroup$ 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 Mummert Sep 3 '16 at 17:27
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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.)

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