Abstract
For a nonparametric prescribed mean curvature surface z=f(x,y) in a vertical cylinder omega xR subset of R3, the existence and behavior of the radial limits of f at a nonconvex corner O2 is an element of partial differential omega are well studied and understood. For a nonparametric prescribed mean curvature hypersurface z=f(x) in a vertical cylinder omega xR subset of Rn+1,n >= 3,at a nonconvex corner On is an element of partial differential omega, the boundary behavior of f is largely unknown. We shall consider the specific example of a nonparametric minimal hypersurface in R4 and investigate its behavior at a nonconvex conical point of the boundary of its domain.