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when toggle format what by license comment
Nov 17, 2016 at 5:32 vote accept Yosemite Sam
Nov 1, 2016 at 18:20 comment added Leonid Positselski See also the same explained in mathoverflow.net/questions/223449/…
Nov 1, 2016 at 18:08 history edited Leonid Positselski CC BY-SA 3.0
"arbitrary characteristic" mentioned; $C$ replaced by $C_+$ someplace
Nov 1, 2016 at 18:03 history answered Leonid Positselski CC BY-SA 3.0