22 Oct
2020
22 Oct
'20
11:10 a.m.
Tom Karzes wrote: ----- The minimal solution is unique up to multiplication by a unit (1, i, -1, -i). ----- This depends on the point set. If say it's X = {(0,0), (5,0), (10,0), (15,0), (20,0)} Then there are 12 rotations about the origin that carry X into a set of integer points. (By angles N*90º and N*90º ± atan2(3,4), N = 0, 1, 2, 3.) —Dan