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Additional symmetries of KP, Grassmannian, and the string equation. (English) Zbl 1020.37555

MSC:
37K10 Completely integrable infinite-dimensional Hamiltonian and Lagrangian systems, integration methods, integrability tests, integrable hierarchies (KdV, KP, Toda, etc.)
35A30 Geometric theory, characteristics, transformations in context of PDEs
35Q53 KdV equations (Korteweg-de Vries equations)
81T40 Two-dimensional field theories, conformal field theories, etc. in quantum mechanics
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