Compactness of the set of multisoliton solutions of the nonlinear Schrödinger equation
Sbornik. Mathematics, Tome 75 (1993) no. 2, pp. 429-443 Cet article a éte moissonné depuis la source Math-Net.Ru

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Multisoliton solutions $\psi(x,t)$ of the nonlinear Schrödinger equation are considered which satisfy the condition of finite density: $$ \lim_{x\to\pm\infty}\psi(x,t)=\frac12\omega e^{i\psi_\pm}. $$ It is proved that all these solutions satisfy the inequalities $$ \sup_{\substack{-\infty<x<\infty\\-\infty<t<\infty}}\biggl|\frac{\partial^m} {\partial t^m}\frac{\partial^n}{\partial x^n}\psi(x,\,t)\biggr|\leqslant\frac14 (2\omega)^{1+n+2m}(n+2m)! $$ ($m,n=0,1,2,\dots$), which implies solvability of the Cauchy problem for the nonlinear Schrödinger equation with an initial function $\psi(x,0)$ belonging to the closure of the set of nonreflecting potentials.
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     author = {D. Sh. Lundina and V. A. Marchenko},
     title = {Compactness of the set of multisoliton solutions of the nonlinear {Schr\"odinger} equation},
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     year = {1993},
     volume = {75},
     number = {2},
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D. Sh. Lundina; V. A. Marchenko. Compactness of the set of multisoliton solutions of the nonlinear Schrödinger equation. Sbornik. Mathematics, Tome 75 (1993) no. 2, pp. 429-443. http://geodesic.mathdoc.fr/item/SM_1993_75_2_a6/

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