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descendant subgroup
In mathematics, in the field of group theory, a subgroup of a group is said to be descendant if there is a descending series starting from the subgroup and ending at the group, such that every term in the series is a normal subgroup of its predecessor.
The series may be infinite. If the series is finite, then the subgroup is subnormal.
==See also==
* Ascendant subgroup
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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