Geodesic
$Q$-operator for the quantum NLS model
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 25, Tome 473 (2018), pp. 34-65 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper we show that an operator introduced by A. A. Tsvetkov enjoys all the needed properties of $Q$-operator. It is shown that the $Q$-operator of the $XXX$ spin chain with spin $\ell$ turns into Tsvetkov's operator in the continuous limit when $\ell \rightarrow \infty$. 
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     author = {N. M. Belousov and S. E. Derkachov},
     title = {$Q$-operator for the quantum {NLS} model},
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N. M. Belousov; S. E. Derkachov. $Q$-operator for the quantum NLS model. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 25, Tome 473 (2018), pp. 34-65. http://geodesic.mathdoc.fr/item/ZNSL_2018_473_a2/

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