Electronic Journal of Differential Equations, Vol. 2013 (2013), No. 138, pp. 1-5. Title: Existence of solutions to non-local problems for parabolic-hyperbolic equations with three lines of type changing Authors: Erkinjon T. Karimov (National Univ. of Uzbekistan, Tashkent, Uzbekistan) Akmal I. Sotvoldiyev (National Univ. of Uzbekistan, Tashkent, Uzbekistan) Abstract: In this work, we study a boundary problem with non-local conditions, by relating values of the unknown function with various characteristics. The parabolic-hyperbolic equation with three lines of type changing is equivalently reduced to a system of Volterra integral equations of the second kind. Submitted May 14, 2013. Published June 20, 2013. Math Subject Classifications: 35M10. Key Words: Parabolic-hyperbolic equation; non-local condition; Volterra integral equation.