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Oct 1, 2020 at 5:35 history edited Martin Väth CC BY-SA 4.0
Added the original formulation of Robert Isreal.
Oct 1, 2020 at 5:25 comment added Martin Väth Yes. I added a sketch of the proof.
Oct 1, 2020 at 5:24 history edited Martin Väth CC BY-SA 4.0
Added sketch of proof
Oct 1, 2020 at 4:52 vote accept Duplicate
Sep 30, 2020 at 19:22 comment added Denis Serre By "has the required property", you mean that this set is a counter-example to the property stated in the question ?
Sep 30, 2020 at 18:26 history answered Martin Väth CC BY-SA 4.0