An Extension of the KdV Hierarchy Arising from a Representation of a Toroidal Lie Algebra

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Abstract: In this article we show how to construct hierarchies of partial differential equations from the vertex operator representations of toroidal Lie algebras. In the smallest example - rank 2 toroidal cover of

s l_{2}

- we obtain an extension of the KdV hierarchy. We use the action of the corresponding infinite-dimensional group to construct solutions for these non-linear PDEs.

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