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Observable subgroup : ウィキペディア英語版 | Observable subgroup In mathematics, in the representation theory of algebraic groups, an observable subgroup is an algebraic subgroup of a linear algebraic group whose every finite-dimensional rational representation arises as the restriction to the subgroup of a finite-dimensional rational representation of the whole group. An equivalent formulation, in case the base field is closed, is that ''K'' is an observable subgroup of ''G'' if and only if the quotient variety ''G''/''K'' is a quasi-affine variety. Some basic facts about observable subgroups: * Every normal algebraic subgroup of an algebraic group is observable. * Every observable subgroup of an observable subgroup is observable. ==External links==
* (Extensions of Representations of algebraic linear groups )
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「Observable subgroup」の詳細全文を読む
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