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  2. Loop algebra - Wikipedia

    en.wikipedia.org/wiki/Loop_algebra

    There is a natural derivation on the loop algebra, conventionally denoted acting as : = and so can be thought of formally as =. It is required to define affine Lie algebras , which are used in physics, particularly conformal field theory .

  3. Quasigroup - Wikipedia

    en.wikipedia.org/wiki/Quasigroup

    A quasigroup with an idempotent element is called a pique ("pointed idempotent quasigroup"); this is a weaker notion than a loop but common nonetheless because, for example, given an abelian group, (A, +), taking its subtraction operation as quasigroup multiplication yields a pique (A, −) with the group identity (zero) turned into a "pointed ...

  4. List of problems in loop theory and quasigroup theory

    en.wikipedia.org/wiki/List_of_problems_in_loop...

    In mathematics, especially abstract algebra, loop theory and quasigroup theory are active research areas with many open problems.As in other areas of mathematics, such problems are often made public at professional conferences and meetings.

  5. Dynkin diagram - Wikipedia

    en.wikipedia.org/wiki/Dynkin_diagram

    However, n does not equal the dimension of the defining module (a fundamental representation) of the Lie algebra – the index on the Dynkin diagram should not be confused with the index on the Lie algebra. For example, corresponds to + =, which naturally acts on 9-dimensional space, but has rank 4 as a Lie algebra.

  6. Weyl group - Wikipedia

    en.wikipedia.org/wiki/Weyl_group

    For example, for the general linear group GL, a maximal torus is the subgroup D of invertible diagonal matrices, whose normalizer is the generalized permutation matrices (matrices in the form of permutation matrices, but with any non-zero numbers in place of the '1's), and whose Weyl group is the symmetric group.

  7. Loop representation in gauge theories and quantum gravity

    en.wikipedia.org/wiki/Loop_representation_in...

    Theorems establishing the uniqueness of the loop representation as defined by Ashtekar et al. (i.e. a certain concrete realization of a Hilbert space and associated operators reproducing the correct loop algebra – the realization that everybody was using) have been given by two groups (Lewandowski, Okolow, Sahlmann and Thiemann) [5] and ...

  8. Loop group - Wikipedia

    en.wikipedia.org/wiki/Loop_group

    In its most general form a loop group is a group of continuous mappings from a manifold M to a topological group G.. More specifically, [1] let M = S 1, the circle in the complex plane, and let LG denote the space of continuous maps S 1 → G, i.e.

  9. Lie algebra extension - Wikipedia

    en.wikipedia.org/wiki/Lie_algebra_extension

    Starting with a polynomial loop algebra over finite-dimensional simple Lie algebra and performing two extensions, a central extension and an extension by a derivation, one obtains a Lie algebra which is isomorphic with an untwisted affine Kac–Moody algebra. Using the centrally extended loop algebra one may construct a current algebra in two ...

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