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arxiv: hep-th/9808153 · v2 · submitted 1998-08-25 · ✦ hep-th

Bethe Equations "on the Wrong Side of Equator"

classification ✦ hep-th
keywords solutionequationsbaxterbethe-ansatzsecondanalyseapartbethe
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We analyse the famous Baxter's $T-Q$ equations for $XXX$ ($XXZ$) spin chain and show that apart from its usual polynomial (trigonometric) solution, which provides the solution of Bethe-Ansatz equations, there exists also the second solution which should corresponds to Bethe-Ansatz beyond $N/2$. This second solution of Baxter's equation plays essential role and together with the first one gives rise to all fusion relations.

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