Geodesic
Exceptional solutions to the Bethe ansatz equations
Teoretičeskaâ i matematičeskaâ fizika, Tome 69 (1986) no. 2, pp. 163-174

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The properties of some special solutions of the equations of the Bethe ansatz are investigated. Examples of nontrivial Bethe vectors corresponding to solutions with equal values of the spectral parameters are found. These cases are interpreted in the context of both the algebraic and coordinate Bethe ansatz. The coordinate ansatz is generalized to the case of the XXX model of arbitrary spin. 
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     author = {L. V. Avdeev and A. A. Vladimirov},
     title = {Exceptional solutions to the {Bethe} ansatz equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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L. V. Avdeev; A. A. Vladimirov. Exceptional solutions to the Bethe ansatz equations. Teoretičeskaâ i matematičeskaâ fizika, Tome 69 (1986) no. 2, pp. 163-174. http://geodesic.mathdoc.fr/item/TMF_1986_69_2_a0/