Add ChiefLength (length of any chief series)#6455
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This is invariant under isomorphisms. Declare also `CommutatorLength` and `DerivedLength` as isomorphism invariant.
ThomasBreuer
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fingolfin
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Jul 8, 2026
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Fine by me.
Though where is the cutoff for e.g. InstallIsomorphismMaintenance ? E.g. we could also apply it to AbelianInvariants, AbelianRank, PClassPGroup, PrimePGroup, RankPGroup, NrConjugacyClasses
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This is invariant under isomorphisms.
Declare also
CommutatorLengthandDerivedLengthas isomorphism invariant.Define
ChiefLengthalso for character tables, since it can be computed from the lattice of normal subgroups.