This book deal with nonlinear parboic epuations and systems of second order in higher dimensional domains, aninly several initial-boundary value problems for nonlinear parabolic equations and systems of second order equatiohns with smooth coefficents or measurable coefficients are dixcussed. There are two characteristics of this booku. One is that parabolic equations are discussed in the nonilinear case and the boundary condittions include the irregualr oblique derivative case, another one is th