Geodesic
A new hyperbolic equation possessing a zero-curvature representation
Fundamentalʹnaâ i prikladnaâ matematika, Tome 10 (2004) no. 1, pp. 239-241 
M. Pobořil. A new hyperbolic equation possessing a zero-curvature representation. Fundamentalʹnaâ i prikladnaâ matematika, Tome 10 (2004) no. 1, pp. 239-241. http://geodesic.mathdoc.fr/item/FPM_2004_10_1_a10/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Using a direct procedure to compute a zero-curvature representation (ZCR) we find a previously unknown hyperbolic equation which possesses an $\mathfrak{sl}_2$-valued ZCR. This ZCR admits no parameter and is not reducible to a proper subalgebra of $\mathfrak{sl}_2$.

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