By Evgeny V. Doktorov, Sergey B. Leble

ISBN-10: 1402061382

ISBN-13: 9781402061387

This monograph systematically develops and considers the so-called "dressing approach" for fixing differential equations (both linear and nonlinear), a way to generate new non-trivial recommendations for a given equation from the (perhaps trivial) answer of an analogous or similar equation. the first issues of the dressing approach coated listed here are: the Moutard and Darboux variations came upon in XIX century as utilized to linear equations; the BÃncklund transformation in differential geometry of surfaces; the factorization technique; and the Riemann-Hilbert challenge within the shape proposed by way of Shabat and Zakharov for soliton equations, plus its extension when it comes to the d-bar formalism.Throughout, the textual content exploits the "linear event" of presentation, with detailed realization given to the algebraic facets of the most mathematical buildings and to sensible principles of acquiring new options. numerous linear equations of classical and quantum mechanics are solved via the Darboux and factorization equipment. An extension of the classical Darboux modifications to nonlinear equations in 1+1 and 2+1 dimensions, in addition to its factorization, also are mentioned intimately. what is extra, the applicability of the neighborhood and non-local Riemann-Hilbert problem-based process and its generalization by way of the d-bar procedure are illustrated through a number of nonlinear equations.

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**Additional info for A Dressing Method in Mathematical Physics**

**Example text**

Hence, we have two holomorphic functions in C± which are both zero at infinity and have the jump ln g(k) across the contour γ. 83) and assuming the H¨ older condition for ln g(k), we get the solution dℓ 1 ln g(ℓ). p(k) = 2πi γ ℓ − k Accordingly, (0) φ± (k) = exp ±1 2πi γ dℓ ln g(ℓ) , ℓ−k k ∈ C± . 10 The Riemann–Hilbert problem 27 Therefore, the general solution to the scalar RH problem has the form N φ± (k) = j=1 k − kj k − k¯j ±1 exp ±1 2πi γ dℓ ln g(ℓ) , ℓ−k k ∈ C± . , one or both of Φ± obey this condition).

As a highly nontrivial example of the iterated DT formalism, we describe positon solutions of the Korteweg–de Vries (KdV) equation discovered by Matveev [318, 319]. The growing interest in discrete models appeals to wider classes of symmetry structures of the corresponding nonlinear problems [149, 196, 255, 256, 339]. Very recently a suitable basis for new searches in the field of diﬀerential-diﬀerence and diﬀerence-diﬀerence equations was discovered [321] in the framework of the classical DT theory such that the diﬀerence operator is replaced by an arbitrary automorphism transformation.

18. Suppose an invertible function ϕ is a solution to the linear diﬀerential equation D0 ϕ = Lϕ. 36). 19. 37) for an invertible function ϕ. 38) is a solution of the equation ˜ ˜ ψ. 39) The last statement accomplishes the proof of the Matveev theorem for diﬀerential polynomials [314] in its non-Abelian version. 35) gives a representation of the transformed operator in terms of the generalized Bell polynomials. 41) k = 0, . . , N − 1. 5 Iterations and quasideterminants via Darboux transformation Here we would like to revisit the non-Abelian iterated DT formulas following the ideas of the pioneering paper of Matveev [313], where the basic formulas were derived.

### A Dressing Method in Mathematical Physics by Evgeny V. Doktorov, Sergey B. Leble

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