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S Dec 1, 2018 at 1:25 history bounty ended user521337
S Dec 1, 2018 at 1:25 history notice removed user521337
Dec 1, 2018 at 1:25 vote accept user521337
Nov 25, 2018 at 18:40 answer added Robert Bryant timeline score: 10
S Nov 25, 2018 at 0:34 history bounty started user521337
S Nov 25, 2018 at 0:34 history notice added user521337 Improve details
Nov 14, 2018 at 9:43 answer added GreginGre timeline score: 2
Nov 14, 2018 at 6:50 history edited YCor CC BY-SA 4.0
removed useless and confusing notation
Nov 14, 2018 at 6:46 comment added YCor The notation $x_i^\sigma$ is very misleading... it's like write a arbitrary function $f(x,y)$ of 2 variables with coordinates as $(f(x),f(y))$.
Nov 14, 2018 at 6:40 history edited YCor CC BY-SA 4.0
reduced huge formula and fixed ill-placed period
Nov 14, 2018 at 3:42 history asked user521337 CC BY-SA 4.0