Abstract
So called integrable equations have a zero measure among other equations, just like a gold section has zero measure among all possible sections. Both cases are marked out because of their beauty, and in the first case beauty show itself via a number of mathematical constructions that have appeared in soliton equations, and also via an infinite set of symmetries which are valuable not only for their own sake but also because they give us a lot of connections. Symmetries can unify different soliton equations into a single integrable hierarchy. Thus we get a large universal space which in future may appear to play a role similar to the role of complex plane in mathematics of nineteenth century. Here I present a few examples of links between different equations, which follow from symmetry approach.
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© 1993 Springer-Verlag Berlin Heidelberg
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Orlov, A.Y. (1993). Volterra Operator Algebra for Zero Curvature Representation. Universality of KP. In: Fokas, A.S., Kaup, D.J., Newell, A.C., Zakharov, V.E. (eds) Nonlinear Processes in Physics. Springer Series in Nonlinear Dynamics . Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77769-1_24
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DOI: https://doi.org/10.1007/978-3-642-77769-1_24
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