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The Bethe equations for the isotropic periodic spin-1/2 Heisenberg chain with N sites have solutions containing i/2, -i/2 that are singular: both the corresponding energy and the algebraic Bethe ansatz vector are divergent.
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G. Arutyunov, S. Frolov, and A. Sfondrini, “Exceptional Operators in N=4 super Yang-Mills,” JHEP
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