Orumbayeva, N.T.; Tokmagambetova, T.D.; Nurgalieva, Zh.N.
(KU Publ., 2021-12-30)
In this paper, by means of a change of variables, a nonlinear semi-periodic boundary value problem for
the Goursat equation is reduced to a linear gravity problem for hyperbolic equations. Reintroducing a
new function, ...