Geodesic
A nonlinear identity for the scattering phase of integrable models
Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 3, pp. 362-366 Cet article a éte moissonné depuis la source Math-Net.Ru

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The scattering phase of quantum integrable models is found from linear integral equations of a special type. Solutions of these equations satisfy some nonlinear identities, which, in particular, relate the values of the scattering phase at the boundaries of the Fermi sphere. 
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N. A. Slavnov. A nonlinear identity for the scattering phase of integrable models. Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 3, pp. 362-366. http://geodesic.mathdoc.fr/item/TMF_1998_116_3_a3/

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