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Commit 2021-08-04 08:58 096bdb7a

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refactor(group_theory/solvable): move subgroup commutators into new file (#8534) The theory of nilpotent subgroups also needs a theory of general commutators (if H,K : subgroup G then so is [H,K]), but I don't really want to import solvable groups to get nilpotent groups, so I am breaking the solvable group file into two, splitting off the API for these commutators.

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