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- Yuly Billig
- Quantum Information Processing
- 2013

A connected Lie group G is generated by its two 1-parametric subgroups exp(tX), exp(tY ) if and only if the Lie algebra of G is generated by {X, Y }. We consider decompositions of elements of G into a product of such exponentials with times t > 0 and study the problem of minimizing the total time of the decompositions for a fixed element of G. We solve this… (More)

- Yuly Billig
- 2008

In this paper, we generalize a result by Berman and Billig on weight modules over Lie algebras with polynomial multiplication. More precisely, we show that a highest weight module with an exp-polynomial “highest weight” has finite dimensional weight spaces. We also get a class of irreducible weight modules with finite dimensional weight spaces over… (More)

- Yuly Billig
- 2002

We describe the structure of the irreducible highest weight modules for the twisted Heisenberg-Virasoro Lie algebra at level zero. We prove that such a module is either isomorphic to a Verma module or to a quotient of two Verma modules.

- Yuly Billig
- 2008

0. Introduction. In this article we show how to construct hierarchies of partial differential equations and their soliton-type solutions from the vertex operator representations of toroidal Lie algebras. Soliton theory was given a new impetus when it was linked with the representation theory of infinite-dimensional Lie algebras in the works of Sato [S],… (More)

- Yuly Billig
- 1997

Vertex operators discovered by physicists in string theory have turned out to be important objects in mathematics. One can use vertex operators to construct various realizations of the irreducible highest weight representations for affine Kac-Moody algebras. Two of these, the principal and homogeneous realizations, are of particular interest. The principal… (More)

An explicit vertex operator algebra construction is given of a class of irreducible modules for toroidal Lie algebras. AMS (MOS) Subject Classifications:17B69, 17B68, 17B66, 17B10.

- Robert Moody, Yuly Billig, V Tor = V ˙ G ⊗ V + Hyp ⊗ V Sl N, V Hvir
- 2002

We construct vertex operator representations for the full (N + 1)-toroidal Lie algebra g. We associate with g a toroidal vertex operator algebra, which is a tensor product of an affine VOA, a sub-VOA of a hyperbolic lattice VOA, affine slN VOA and a twisted Heisenberg-Virasoro VOA. The modules for the toroidal VOA are also modules for the toroidal Lie… (More)

- Yuly Billig
- 2008

Magnetic hydrodynamics with asymmetric stress tensor. In this paper we study equations of magnetic hydrodynamics with a stress tensor. We interpret this system as the generalized Euler equation associated with an abelian extension of the Lie algebra of vector fields with a non-trivial 2-cocycle. We use the Lie algebra approach to prove the energy… (More)

- Yuly Billig
- 2009

Toroidal Lie algebras are very natural multi-variable generalizations of affine Kac-Moody algebras. The theory of affine Lie algebras is rich and beautiful, having connections with diverse areas of mathematics and physics. Toroidal Lie algebras are also proving themselves to be useful for the applications. Frenkel, Jing and Wang [FJW] used representations… (More)

- Yuly Billig
- 2009

We show that the representation theory for the toroidal extended affine Lie algebra is controlled by a VOA which is a tensor product of four VOAs: a sub-VOA V + Hyp of a hyperbolic lattice VOA, affine ̂̇g and ŝlN VOAs and a Virasoro VOA. A tensor product of irreducible modules for these VOAs admits the structure of an irreducible module for the toroidal… (More)