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Oct 11, 2023 at 9:08 comment converted from answer Howard Why $H_n$ is not a lattice? Is there any scientific proof? Thanks!
Sep 28, 2023 at 15:35 comment added mathoverflowUser Dear @DenisSerre: Did you make any progress with this question?
Jul 5, 2023 at 11:46 history edited Denis Serre CC BY-SA 4.0
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Jul 5, 2023 at 9:08 history asked Denis Serre CC BY-SA 4.0