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when toggle format what by license comment
Sep 28, 2018 at 13:05 history edited Frieder Ladisch CC BY-SA 4.0
added citation, corrected spelling of name
Sep 26, 2018 at 18:27 comment added Kevin Casto For those (like me until now) who don't know this notation: $A \triangleleft \triangleleft\: G$ apparently means that $A$ is a subnormal subgroup of $G$: groupprops.subwiki.org/wiki/Notation_for_subgroup_properties
Sep 26, 2018 at 17:05 history answered Geoff Robinson CC BY-SA 4.0