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Sep 16, 2021 at 5:50 comment added Henry Cohn In 18, 20, and 22 dimensions, there are non-lattice packings that beat the known lattices, but nobody has found analogous constructions in 19 and 21 dimensions. Maybe there aren't any (it's conceivable that it's a weird parity effect), but I'm guessing that this is more a reflection of what people have tried than what's really out there, and that improvements in 19 and 21 dimensions are possible.
Sep 13, 2021 at 5:53 comment added Turbo @HenryCohn Why do you think $19$ and $21$ dimensions might be amenable?
Sep 14, 2019 at 17:56 comment added Archie Bonus question (but please do not feel forced to answer) : might a polymath type search be a framework in which you'd be tempted to participate (at least from the sidelines, or pehaps more actively still) ?
Sep 14, 2019 at 17:51 comment added Archie Thank you very much for this detailed answer, I couldn't wish for more!
Sep 14, 2019 at 17:50 vote accept Archie
Sep 14, 2019 at 15:18 history answered Henry Cohn CC BY-SA 4.0