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  2. Nilpotent Lie algebra - Wikipedia

    en.wikipedia.org/wiki/Nilpotent_Lie_algebra

    In mathematics, a Lie algebra is nilpotent if its lower central series terminates in the zero subalgebra. The lower central series is the sequence of subalgebras. We write , and for all . If the lower central series eventually arrives at the zero subalgebra, then the Lie algebra is called nilpotent. The lower central series for Lie algebras is ...

  3. Lie algebra - Wikipedia

    en.wikipedia.org/wiki/Lie_algebra

    t. e. In mathematics, a Lie algebra (pronounced / liː / LEE) is a vector space together with an operation called the Lie bracket, an alternating bilinear map , that satisfies the Jacobi identity. In other words, a Lie algebra is an algebra over a field for which the multiplication operation (called the Lie bracket) is alternating and satisfies ...

  4. Nilpotent algebra - Wikipedia

    en.wikipedia.org/wiki/Nilpotent_algebra

    Nilpotent algebra. In mathematics, specifically in ring theory, a nilpotent algebra over a commutative ring is an algebra over a commutative ring, in which for some positive integer n every product containing at least n elements of the algebra is zero. The concept of a nilpotent Lie algebra has a different definition, which depends upon the Lie ...

  5. Nilpotent - Wikipedia

    en.wikipedia.org/wiki/Nilpotent

    The two-dimensional dual numbers contain a nilpotent space. Other algebras and numbers that contain nilpotent spaces include split-quaternions (coquaternions), split-octonions, biquaternions, and complex octonions. If a nilpotent infinitesimal is a variable tending to zero, it can be shown that any sum of terms for which it is the subject is an ...

  6. Baker–Campbell–Hausdorff formula - Wikipedia

    en.wikipedia.org/wiki/Baker–Campbell...

    In mathematics, the Baker–Campbell–Hausdorff formula gives the value of that solves the equation for possibly noncommutative X and Y in the Lie algebra of a Lie group. There are various ways of writing the formula, but all ultimately yield an expression for in Lie algebraic terms, that is, as a formal series (not necessarily convergent) in ...

  7. Engel's theorem - Wikipedia

    en.wikipedia.org/wiki/Engel's_theorem

    In representation theory, a branch of mathematics, Engel's theorem states that a finite-dimensional Lie algebra is a nilpotent Lie algebra if and only if for each , the adjoint map. given by , is a nilpotent endomorphism on ; i.e., for some k. [1] It is a consequence of the theorem, also called Engel's theorem, which says that if a Lie algebra ...

  8. Glossary of Lie groups and Lie algebras - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_Lie_groups_and...

    2. A simple Lie algebra is a Lie algebra that is non abelian and has only two ideals, itself and. { 0 } {\displaystyle \ {0\}} . 3. simply laced group (a simple Lie group is simply laced when its Dynkin diagram is without multiple edges). 4. simple root. A subset. Δ {\displaystyle \Delta } of a root system.

  9. Nilpotent orbit - Wikipedia

    en.wikipedia.org/wiki/Nilpotent_orbit

    Definition. An element X of a semisimple Lie algebra g is called nilpotent if its adjoint endomorphism. ad X: g → g, ad X (Y) = [X, Y] is nilpotent, that is, (ad X) n = 0 for large enough n. Equivalently, X is nilpotent if its characteristic polynomial pad X (t) is equal to tdim g. A semisimple Lie group or algebraic group G acts on its Lie ...