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11 votes
2 answers
565 views

Close cross posts between here and MSE

If a question is cross-posted here and on the Math Stack Exchange, what's the policy to deal with these? For example take this question and its MSE twin. Should one of them be closed? If so, which ...
MvG's user avatar
  • 534
10 votes
0 answers
312 views

What should you do if you find old duplicates?

Sometimes I discover that "old" MO questions are duplicates of even older MO questions. Two examples: Embarrassingly, I found out that my own question: Formula for number of permutations ...
Sam Hopkins's user avatar
  • 22.9k