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Parabolic Lie algebra
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Parabolic Lie algebra : ウィキペディア英語版
Parabolic Lie algebra
In algebra, a parabolic Lie algebra \mathfrak p is a subalgebra of a semisimple Lie algebra \mathfrak g satisfying one of the following two conditions:
* \mathfrak p contains a maximal solvable subalgebra (a Borel subalgebra) of \mathfrak g;
* the Killing perp of \mathfrak p in \mathfrak g is the nilradical of \mathfrak p.
These conditions are equivalent over an algebraically closed field of characteristic zero, such as the complex numbers. If the field \mathbb F is not algebraically closed, then the first condition is replaced by the assumption that
* \mathfrak p\otimes_\overline contains a Borel subalgebra of \mathfrak g\otimes_\overline
where \overline is the algebraic closure of \mathbb F.
==See also==

* Generalized flag variety

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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