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when toggle format what by license comment
Apr 13, 2017 at 12:19 history edited CommunityBot
replaced http://math.stackexchange.com/ with https://math.stackexchange.com/
Jun 2, 2015 at 12:49 comment added james42 I don't know how these characteristic functions are made, the reasoning should be more general... Anyway I'll try this way!
Jun 2, 2015 at 12:26 history answered Hartvigsen CC BY-SA 3.0