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  2. 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.

  3. Loop algebra - Wikipedia

    en.wikipedia.org/wiki/Loop_algebra

    In mathematics, this is insufficient, and the full affine Lie algebra is the vector space [2] ^ = ^ where is the derivation defined above. On this space, the Killing form can be extended to a non-degenerate form, and so allows a root system analysis of the affine Lie algebra.

  4. 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 ...

  5. 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.

  6. 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 ...

  7. Closed-subgroup theorem - Wikipedia

    en.wikipedia.org/wiki/Closed-subgroup_theorem

    In mathematics, the closed-subgroup theorem (sometimes referred to as Cartan's theorem) is a theorem in the theory of Lie groups.It states that if H is a closed subgroup of a Lie group G, then H is an embedded Lie group with the smooth structure (and hence the group topology) agreeing with the embedding.

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