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Intermediate notions between [[normal subgroup]] and [[perfect normal subgroup]] | Intermediate notions between [[normal subgroup]] and [[perfect normal subgroup]]# |
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Normal subgroup whose focal subgroup equals its derived subgroup | Normal subgroup whose focal subgroup equals its derived subgroup |
Subgroup realizable as the commutator of the whole group and a subgroup | Subgroup realizable as the commutator of the whole group and a subgroup |
Upper join of characteristic subgroups | Upper join of characteristic subgroups |