Geodesic
A Classical Solution of the Pentagon Equation Related to the Group $SL(2)$
Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 1, pp. 14-19 Cet article a éte moissonné depuis la source Math-Net.Ru

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A new solution of the pentagon equation related to the flat geometry is obtained; it is invariant under the action of the group $SL(2)$. 
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I. G. Korepanov; E. V. Martyushev. A Classical Solution of the Pentagon Equation Related to the Group $SL(2)$. Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 1, pp. 14-19. http://geodesic.mathdoc.fr/item/TMF_2001_129_1_a1/

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