Hamiltonian structure of pi hierarchy.
Hermitian, symmetric and symplectic random ensembles: PDEs for the distribution of the spectrum.
Hidden symmetries of integrable systems in Yang-Mills theory and Kähler geometry
Higher-order equations of the KdV type are integrable.
Higher-order KdV-type equations and their stability.
Highest Weight Modules of W1+∞, Darboux Transformations and the Bispectral Problem
This paper is a survey of our recent results on the bispectral problem. We describe a new method for constructing bispectral algebras of any rank and illustrate the method by a series of new examples as well as by all previously known ones. Next we exhibit a close connection of the bispectral problem to the representation theory of W1+∞–algerba. This connection allows us to explain and generalise to any rank the result of Magri and Zubelli on the symmetries of the manifold of the bispectral operators...
Hypersurface geometry and Hamiltonian systems of hydrodynamic type.
Inégalités a priori pour des tores lagrangiens invariants par des difféomorphismes symplectiques
Infinitesimal Brunovský form for nonlinear systems with applications to Dynamic Linearization
We define, in an infinite-dimensional differential geometric framework, the 'infinitesimal Brunovský form' which we previously introduced in another framework and link it with equivalence via diffeomorphism to a linear system, which is the same as linearizability by 'endogenous dynamic feedback'.
Initial boundary value problem for the mKdV equation on a finite interval
We analyse an initial-boundary value problem for the mKdV equation on a finite interval by expressing the solution in terms of the solution of an associated matrix Riemann-Hilbert problem in the complex -plane. This RH problem is determined by certain spectral functions which are defined in terms of the initial-boundary values at and . We show that the spectral functions satisfy an algebraic “global relation” which express the implicit relation between all boundary values in terms of spectral...
Integrability and beyond
Integrability and diffeomorphisms on target space.
Integrability of Hamiltonian systems and Birkhoff normal forms in the simple resonance case.
Integrable analytic vector fields with a nilpotent linear part
We study the normalization of analytic vector fields with a nilpotent linear part. We prove that such an analytic vector field can be transformed into a certain form by convergent transformations when it has a non-singular formal integral. We then prove that there are smoothly linearizable parabolic analytic transformations which cannot be embedded into the flows of any analytic vector fields with a nilpotent linear part.
Integrable anisotropic evolution equations on a sphere.
Integrable discrete equations derived by similarity reduction of the extended discrete KP hierarchy.
Integrable dynamical systems obtained by duplication
Integrable equations and their evolutions based on intrinsic geometry of Riemann spaces.
Integrable systems and projective images of Kummer surfaces
Integrable three-dimensional coupled nonlinear dynamical systems related to centrally extended operator Lie algebras and their Lax type three-linearization
The Hamiltonian representation for a hierarchy of Lax type equations on a dual space to the Lie algebra of integro-differential operators with matrix coefficients, extended by evolutions for eigenfunctions and adjoint eigenfunctions of the corresponding spectral problems, is obtained via some special Bäcklund transformation. The connection of this hierarchy with integrable by Lax two-dimensional Davey-Stewartson type systems is studied.