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If a question appears already on a Stack Exchange website, should it be marked as a duplicate question?

I think not (and that seems to be the practice here).

Should a reviewer take any specific action when such a question is reviewed other than giving links to related questions as a comment?

PS: To clarify, I am interested in questions that are on-topic on multiple Stack Exchange sites. The related question What to do with cross-site duplicates? seems to focus on questions that are posted in one site but belongs to another.

To further clarify, my interest is in questions posted by another user on another website unaware of the first question (can happen when the tittle of the first question is not very specific).

Example: How can I understand the Coppersmith–Winograd algorithm? is a cross-site duplicate of Fast Matrix Multiplication.

  • @SonictheAnonymousHedgehog Please see the post-note. Thank you for pointing this out – Cyriac Antony Feb 4 at 7:18
  • Oh, I think this is a duplicate of Duplicate questions on other SE sites? after all – Cyriac Antony Feb 4 at 7:19
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    TLDR this is impossible anyway, and the answers to questions already linked above explain what should/does happen in various cases of duplication. – Nij Feb 4 at 7:21
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    In your scenario, is the question posted on two or more different sites by the same author? Is there a time difference between the questions? For example, the "duplicate" question was posted several months ago on a different site. Was the same question posted by two or more different users but on different sites? – Mari-Lou A Feb 4 at 7:21
  • I think you didn't address another issue with your question; you said I think not (and that seems to be the practice here). but you gave no evidence that shows a question being closed as a duplicate of another but posted on a different site. Have you seen this happen? Can you provide a link where this practice has happened? – Mari-Lou A Feb 4 at 8:48
  • @Mari-LouA I think not means "i think cross-site duplicate should not be marked as duplicate" – Cyriac Antony Feb 4 at 8:50
  • But you said that seems to be the practice and I now see how that statement is ambiguous because it seemed to infer that it was the norm. In other words, you saw posts being closed as duplicates of posts from different sites. Instead you were saying that was not the case. – Mari-Lou A Feb 4 at 8:58

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