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when toggle format what by license comment
Mar 25, 2018 at 13:49 history edited Derek Holt CC BY-SA 3.0
added 291 characters in body
Mar 25, 2018 at 13:06 comment added H A Helfgott This is a good answer to the question I mistakenly asked at first (bounding the length of subgroup chains).
Mar 24, 2018 at 18:19 history answered Derek Holt CC BY-SA 3.0