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Nov 21, 2023 at 7:37 comment added P. Quinton Thank you for your answer, you are right, it is a counter example. It would be interesting to find a necessary and sufficient condition on those sets for separability, some more work is needed !
Nov 21, 2023 at 7:37 vote accept P. Quinton
Nov 17, 2023 at 8:26 history answered gerw CC BY-SA 4.0