Geodesic
Bethe equations “on the wrong side of the equator”
Teoretičeskaâ i matematičeskaâ fizika, Tome 118 (1999) no. 3, pp. 452-461 Cet article a éte moissonné depuis la source Math-Net.Ru

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The $T$–$Q$ Baxter equations for the $XXX$ ($XXZ$) spin chain are analyzed. For each polynomial (trigonometric) solution of degree not exceeding $N/2$, which provides a solution of the Bethe ansatz equations, there exists a second linearly independent polynomial solution of degree greater than $N/2$. This second solution plays an essential role; in particular, all fusion relations follow from these two solutions. 
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G. P. Pron'ko; Yu. G. Stroganov. Bethe equations “on the wrong side of the equator”. Teoretičeskaâ i matematičeskaâ fizika, Tome 118 (1999) no. 3, pp. 452-461. http://geodesic.mathdoc.fr/item/TMF_1999_118_3_a15/

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