Search results
Results From The WOW.Com Content Network
Thus, the Jacobi identity for Lie algebras states that the action of any element on the algebra is a derivation. That form of the Jacobi identity is also used to define the notion of Leibniz algebra. Another rearrangement shows that the Jacobi identity is equivalent to the following identity between the operators of the adjoint representation:
Carl Gustav Jacob Jacobi (/ dʒ ə ˈ k oʊ b i /; [2] German:; 10 December 1804 – 18 February 1851) [a] was a German mathematician who made fundamental contributions to elliptic functions, dynamics, differential equations, determinants and number theory.
The definition of a Lie algebra over a field extends to define a Lie algebra over any commutative ring R. Namely, a Lie algebra over R is an R-module with an alternating R-bilinear map [ , ]: that satisfies the Jacobi identity.
The book introduces Jacobi elliptic functions and the Jacobi triple product identity. One of the most exciting moments of my life was when, after computing several of these series, I went down to our mathematical library and found some of them in Jacobi's "Fundamenta nova theoriae..."[3], with the same coefficients down to the last decimal digit!
The Schouten–Nijenhuis bracket makes the multivector fields into a Lie superalgebra if the grading is changed to the one of opposite parity (so that the even and odd subspaces are switched), though with this new grading it is no longer a supercommutative ring. Accordingly, the Jacobi identity may also be expressed in the symmetrical form
where d is the differential and = is the tangent space at the origin e (e being the identity element of the group G). Since Ψ g {\displaystyle \Psi _{g}} is a Lie group automorphism, Ad g is a Lie algebra automorphism ; i.e., an invertible linear transformation of g {\displaystyle {\mathfrak {g}}} to itself that preserves the Lie bracket .
Jacobi coordinates, a simplification of coordinates for an n-body system; Jacobi identity for non-associative binary operations; Jacobi's formula for the derivative of the determinant of a matrix; Jacobi triple product, an identity in the theory of theta functions; Jacobi's theorem (disambiguation), several theorems
For a Lie group, the corresponding Lie algebra is the tangent space at the identity , which can be identified with the vector space of left invariant vector fields on . The Lie bracket of two left invariant vector fields is also left invariant, which defines the Jacobi–Lie bracket operation [ ⋅ , ⋅ ] : g × g → g {\displaystyle [\,\cdot ...