Geodesic
Finite-dimensional analogues of the string $s\leftrightarrow t$ duality and the pentagon equation
Teoretičeskaâ i matematičeskaâ fizika, Tome 120 (1999) no. 1, pp. 54-63 Cet article a éte moissonné depuis la source Math-Net.Ru

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We use a variant of the functional pentagon equation (FPE) from the theory of integrable models as an algebraic explanation of the phenomenon known in physics as the $s\leftrightarrow t$ duality. We present two simple geometric examples of FPE solutions, one of which yields the Veneziano four-particle amplitude as a particular case. We interpret our FPE solutions in terms of relations in Lie groups. 
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I. G. Korepanov; S. Saito. Finite-dimensional analogues of the string $s\leftrightarrow t$ duality and the pentagon equation. Teoretičeskaâ i matematičeskaâ fizika, Tome 120 (1999) no. 1, pp. 54-63. http://geodesic.mathdoc.fr/item/TMF_1999_120_1_a3/

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