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Continuous and Discrete (Classical) Heisenberg Spin Chain Revised
Symmetry, integrability and geometry: methods and applications, Tome 3 (2007) Cet article a éte moissonné depuis la source Math-Net.Ru

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Most of the work done in the past on the integrability structure of the Classical Heisenberg Spin Chain (CHSC) has been devoted to studying the $su(2)$ case, both at the continuous and at the discrete level. In this paper we address the problem of constructing integrable generalized “Spin Chains” models, where the relevant field variable is represented by a $N\times N$ matrix whose eigenvalues are the $N^{\rm th}$ roots of unity. To the best of our knowledge, such an extension has never been systematically pursued. In this paper, at first we obtain the continuous $N\times N$ generalization of the CHSC through the reduction technique for Poisson–Nijenhuis manifolds, and exhibit some explicit, and hopefully interesting, examples for $3\times 3$ and $4\times 4$ matrices; then, we discuss the much more difficult discrete case, where a few partial new results are derived and a conjecture is made for the general case.
Keywords: integrable systems; Heisenberg chain; Poisson–Nijenhuis manifolds; geometric reduction; $R$-matrix; modified Yang–Baxter. 
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     author = {Orlando Ragnisco and Federico Zullo},
     title = {Continuous and {Discrete} {(Classical)} {Heisenberg} {Spin} {Chain} {Revised}},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a32/}
}
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Orlando Ragnisco; Federico Zullo. Continuous and Discrete (Classical) Heisenberg Spin Chain Revised. Symmetry, integrability and geometry: methods and applications, Tome 3 (2007). http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a32/

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