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Mar 17, 2017 at 15:39 comment added TonyK @მამუკა ჯიბლაძე: if $n < 4$ then $2\sqrt n/2 < 2$.
Mar 17, 2017 at 11:17 vote accept Arseniy Akopyan
Mar 17, 2017 at 11:17
Mar 17, 2017 at 10:52 comment added მამუკა ჯიბლაძე How does velocity enter the picture, and why does the argument only work for $n\ge4$?
Mar 17, 2017 at 10:47 comment added Arseniy Akopyan Yes, I think it is correct.
Mar 17, 2017 at 10:31 history answered Ivan Izmestiev CC BY-SA 3.0