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Sep 22 at 14:45 comment added Nikita Kalinin thank you very much for tracking this down!
Sep 22 at 14:45 history bounty ended Nikita Kalinin
Sep 22 at 14:45 vote accept Nikita Kalinin
Sep 21 at 12:43 history edited N M CC BY-SA 4.0
Removed extraneous comment
Sep 21 at 2:39 history edited N M CC BY-SA 4.0
Fixed Hurwitz citation
Sep 21 at 0:28 history edited N M CC BY-SA 4.0
Removed ungrammatical parenthetical
Sep 21 at 0:20 history edited N M CC BY-SA 4.0
Added historical information
Sep 18 at 19:34 comment added Nikita Kalinin thank you! Yes, I think I can prove it the same way for any quadratic form. But the connection to Conway's topography is worth thinking about, I cannot say now what is the relation but I like it very much!!!
Sep 18 at 18:31 history answered N M CC BY-SA 4.0