On classification of integrable non-evolutionary equations

Details On classification of integrable non-evolutionary equations On classification of integrable non-evolutionary equations

2006-01-22

arxiv.org/abs/nlin/0601046v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

22 pages

Scientific paper

We study partial differential equations of second order (in time) that possess a hierarchy of infinitely many higher symmetries. The famous Boussinesq equation is a member of this class after the extension of the differential polynomial ring. We develop the perturbative symmetry approach in symbolic representation. Applying it, we classify the integrable equations of 4th and 6th order (in the space derivative) equations, as well as we have found three new 10th order integrable equations. To prove the integrability we provide the corresponding bi-Hamiltonian structures and recursion operators.

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