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In mathematics, the special linear Lie algebra of order over a field, denoted or (,), is the Lie algebra of all the matrices (with entries in ) with trace zero and with the Lie bracket [,]:= given by the commutator. This algebra is well studied and understood, and is often used as a model for the study of other Lie algebras.
In mathematics, the special linear group SL(n, R) of degree n over a commutative ring R is the set of n × n matrices with determinant 1, with the group operations of ordinary matrix multiplication and matrix inversion.
Lie algebra dim/C; C n: group operation is addition N 0 0 abelian C n: n: C ×: nonzero complex numbers with multiplication N 0 Z: abelian C: 1 GL(n,C) general linear group: invertible n×n complex matrices: N 0 Z: For n=1: isomorphic to C ×: M(n,C) n 2: SL(n,C) special linear group: complex matrices with determinant. 1 N 0 0 for n=1 this is a ...
A Lie algebra can be viewed as a non-associative algebra, and so each Lie algebra over a field F determines its Lie algebra of derivations, (). That is, a derivation of g {\displaystyle {\mathfrak {g}}} is a linear map D : g → g {\displaystyle D\colon {\mathfrak {g}}\to {\mathfrak {g}}} such that
Let be a Lie algebra and let be a vector space. We let () denote the space of endomorphisms of , that is, the space of all linear maps of to itself. Here, the associative algebra () is turned into a Lie algebra with bracket given by the commutator: [,] = for all s,t in ().
The group SL(2, R) acts on its Lie algebra sl(2, R) by conjugation (remember that the Lie algebra elements are also 2 × 2 matrices), yielding a faithful 3-dimensional linear representation of PSL(2, R). This can alternatively be described as the action of PSL(2, R) on the space of quadratic forms on R 2. The result is the following representation:
In other words, a linear Lie algebra is the image of a Lie algebra representation. Any Lie algebra is a linear Lie algebra in the sense that there is always a faithful representation of g {\displaystyle {\mathfrak {g}}} (in fact, on a finite-dimensional vector space by Ado's theorem if g {\displaystyle {\mathfrak {g}}} is itself finite ...
Many Lie groups can be viewed as linear algebraic groups over the field of real or complex numbers. (For example, every compact Lie group can be regarded as a linear algebraic group over R (necessarily R-anisotropic and reductive), as can many noncompact groups such as the simple Lie group SL(n,R).)
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