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Jordan triple system : ウィキペディア英語版
Triple system

In algebra, a triple system (or ternar) is a vector space ''V'' over a field F together with a F-trilinear map
: (\cdot,\cdot,\cdot) \colon V\times V \times V\to V.
The most important examples are Lie triple systems and Jordan triple systems. They were introduced by Nathan Jacobson in 1949 to study subspaces of associative algebras closed under triple commutators , ''w''] and triple anticommutators {''u'', {''v'', ''w''}}. In particular, any Lie algebra defines a Lie triple system and any Jordan algebra defines a Jordan triple system. They are important in the theories of symmetric spaces, particularly Hermitian symmetric spaces and their generalizations ((R-space )]s and their noncompact duals).
==Lie triple systems==

A triple system is said to be a Lie triple system if the trilinear form, denoted (), satisfies the following identities:
: () = -()
: () + () + () = 0
: ,x,y] + + + + + + , is a derivation (algebra)">derivation of the triple product. The identity also shows that the space k = span is closed under commutator bracket, hence a Lie algebra.
Writing m in place of ''V'', it follows that
:\mathfrak g := \mathfrak k \oplus\mathfrak m
can be made into a Lie algebra with bracket
:() = (()+L_, L(v) - M(u)).
The decomposition of g is clearly a symmetric decomposition for this Lie bracket, and hence if ''G'' is a connected Lie group with Lie algebra g and ''K'' is a subgroup with Lie algebra k, then ''G''/''K'' is a symmetric space.
Conversely, given a Lie algebra g with such a symmetric decomposition (i.e., it is the Lie algebra of a symmetric space), the triple bracket (''v'' ), ''w''] makes m into a Lie triple system.

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「Triple system」の詳細全文を読む



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