Посилання:A Reciprocal Transformation for the Constant Astigmatism Equation / A. Hlaváč, M. Marvan // Symmetry, Integrability and Geometry: Methods and Applications. — 2014. — Т. 10. — Бібліогр.: 31 назв. — англ.
Підтримка:We are indebted to I.S. Krasil’shchik for reading the manuscript and valuable comments. A.H.
was supported by Silesian University in Opava under the student grant project SGS/1/2011,
M.M. was supported by GACR under project P201/11/0356.
We introduce a nonlocal transformation to generate exact solutions of the constant astigmatism equation zyy+(1/z)xx+2=0. The transformation is related to the special case of the famous Bäcklund transformation of the sine-Gordon equation with the Bäcklund parameter λ=±1. It is also a nonlocal symmetry.