By Evgeny V. Doktorov, Sergey B. Leble

This monograph systematically develops and considers the so-called "dressing approach" for fixing differential equations (both linear and nonlinear), a method to generate new non-trivial options for a given equation from the (perhaps trivial) resolution of a similar or similar equation. the first issues of the dressing approach coated listed below are: the Moutard and Darboux variations stumbled on in XIX century as utilized to linear equations; the BÃncklund transformation in differential geometry of surfaces; the factorization approach; and the Riemann-Hilbert challenge within the shape proposed via Shabat and Zakharov for soliton equations, plus its extension by way of the d-bar formalism.Throughout, the textual content exploits the "linear adventure" of presentation, with designated awareness given to the algebraic facets of the most mathematical structures and to functional principles of acquiring new strategies. a variety of linear equations of classical and quantum mechanics are solved via the Darboux and factorization tools. An extension of the classical Darboux differences 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 method and its generalization when it comes to the d-bar technique are illustrated through numerous nonlinear equations.

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

**Example text**

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.

97) as well. 98) with the ∂¯ operator, we encounter the expression ¯ ∂(z − ζ)−1 . 100) where δ(z − ζ) = δ(x − ζR )δ(y − ζI ) is the Dirac delta function. Hence, the integral with the delta function gives C dz ∧ d¯ z f (z, z¯)δ(z − z0 ) = −2if (z0 , z¯0 ). 101) We know from Sect. 1 that the Cauchy-type integral f (z) = 1 2πi ∞ dζ −∞ g(ζ) ζ −z determines a sectionally analytic function with a jump across the real axis Imz = 0. 83) ¯ (z) = ∂¯ 1 ∂f 2πi ∞ −∞ i g(ζ) = dζ ζ −z 2 ∞ −∞ dζg(ζ)δ(ζ − z) = i g(x)δ(y) 2 i [f+ (x) − f− (x)] δ(y).

The monodromy is proved trivial iﬀ the operator L is intertwined with L0 by a finite product of the DTs. 3 Results for diﬀerential operators 9 that a given operator A = Dn + ... + a0 having the kernel K intertwines operators L and L0 . 1) and the statement about division of L0 by A [191]. Then the theorem about the important property of the potential having only regular singularities generalizes the statement of [137] for the matrix potentials. 30) having trivial monodromy. The monodromy operator is expressed via the quasideterminant (see the definition in Sect.