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Sometimes the exact same question is asked verbatim in two different places, for example: On Stack Overflow and in MATLAB Central.

The author has accepted the answer to the latter case, and I wanted to discuss whether this can be marked somehow as a way to close the question. The close as duplicate only works within Stack Overflow... Any views?

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    Add a CW wiki pointing to that other answer. Do make sure to check wether or not that other site allows copying their content and under what conditions.
    – Luuklag
    Nov 14, 2021 at 7:43
  • Stack Exchange sites are "repositories of knowledge"; whether the question (even an exact copy) has been answered elsewhere is kind of irrelevant, if it's a high quality and on-topic question that belongs here.
    – zcoop98
    Nov 15, 2021 at 23:35

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This wouldn't, fundamentally, be any different to a link only answer so pretty much all the reasons that they're a bad idea would also apply to closing a question on a Stack Exchange site as a duplicate of a question answered on a non-Stack Exchange site.

Referencing off-site resources in an answer that support the answer, or provide additional context or information that's broader/deeper than the question being answered is great. Relying on an off-site resource to provide the answer to a question.. that's brittle for many reasons and shouldn't be considered for the network.

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