Adler, V.Gürel, B.Gürses M.Habibullin, I.2016-02-082016-02-0819970305-4470http://hdl.handle.net/11693/25632The problem of constructing boundary conditions for nonlinear equations compatible with higher symmetries is considered. In particular, this problem is discussed for the sine-Gordon, Jiber-Shabat, Liouville and KdV equations. New results are obtained for the last two ones. The boundary condition for the KdV contains two arbitrary constants. The substitution u = qx maps it onto the boundary condition with linear dependence on t for the potentiated KdV.EnglishArticle10.1088/0305-4470/30/10/0251361-6447