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central subgroup : ウィキペディア英語版 | central subgroup In mathematics, in the field of group theory, a subgroup of a group is termed central if it lies inside the center of the group. Given a group , the center of , denoted as , is defined as the set of those elements of the group which commute with every element of the group. The center is a characteristic subgroup and is also an abelian group (because, in particular, all elements of the center must commute with each other). A subgroup of is termed ''central'' if . Central subgroups have the following properties: * They are abelian groups. * They are normal subgroups. They are central factors, and are hence transitively normal subgroups. == References ==
* .
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「central subgroup」の詳細全文を読む
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