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Glossary of Lie algebras
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Glossary of Lie algebras : ウィキペディア英語版
Glossary of Lie algebras

This is a glossary for the terminology applied in the mathematical theories of Lie algebras. The statements in this glossary mainly focus on the algebraic sides of the concepts, without referring to Lie groups or other related subjects.
==Definition==
; Lie algebra
: A vector space \mathfrak over a field F with a binary operation (called the Lie bracket or abbr. bracket) , which satisfies the following conditions: \forall a,b \in F, x,y,z \in \mathfrak,
:# () = a() + b() (bilinearity)
:# () = 0 (alternating)
:# (), z ] + y,z],x] + z,x],y] = 0 (Jacobi identity)
; associative algebra
: An associative algebra A can be made to a Lie algebra by defining the bracket () = xy-yx (the commutator of x,y) \forall x,y \in A .
; homomorphism : A vector space homomorphism \phi : \mathfrak_1 \to \mathfrak_2 is said to be a Lie algebra homomorphism if \phi(()) = (\phi(x), \phi(y) ) \, \forall x,y \in \mathfrak_1.
; adjoint representation
:

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