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2 votes

References for infinite-dimensional integrable systems?

It's not entirely clear what you mean by a "physical/geometric understanding of the corresponding integrable system" because each one will be unique in some sense. A good collection of survey papers …
Phil Harmsworth's user avatar
1 vote

Integrability conditions for differential equations on $J^\infty$

Section 4 of the paper "Geometry of Differential Equations" by B. Kruglikov and V. Lychagin (IHES/M/07/04) states that formal integrability & analyticity are sufficient for the existence of a solution …
Phil Harmsworth's user avatar
2 votes

What functions do we need to solve linear second order differential equations with polynomia...

For an account of integrability of linear ODE in the way that you describe, refer section 4 of the 2004 paper A.G. Khovanskii, "On solvability and unsolvability of equations in explicit form" Uspekhi …
Phil Harmsworth's user avatar
9 votes

Proving a system is nonintegrable /not solvable with Inverse Scattering Transform

The prolongation structure method developed by Wahlquist and Estabrook is one method to show whether or not a PDE is solvable via the inverse scattering transform. (There are others - refer Y. Kosman …
Phil Harmsworth's user avatar
2 votes
Accepted

Lax pair of an integrable non-linear PDE

You could try using the Wahlquist-Estabrook prolongation structure technique, per H.D. Wahlquist and F.B. Estabrook, J. Math. Phys 16 (1975) 1-7 (covering the Korteweg-deVries equation), & F.B. Estabr …
Phil Harmsworth's user avatar
1 vote

Literature on ZS-AKNS systems with independent potentials

Beals and Coifman provided a general analysis of the IST for the $N\times N$ version of the AKNS problem (see Comm. Pure Appl. Math. 37 (1984) 39-90 and their subsequent papers). Their analysis appea …
Phil Harmsworth's user avatar
1 vote

Lax pairs in an abstract formalism

The paper by R. Beals and R. R. Coifman, "Inverse Scattering and Evolution Equations" Communications on Pure and Applied Mathematics 38(1) (1985) pp. 29-42 may be helpful. They do go beyond the KdV eq …
Phil Harmsworth's user avatar