An overview of the lower and upper solutions method with nonlinear boundary value conditions (Q610850)

This is a nice and well documented survey article on the use of lower and upper solutions in the study of second order differential equations of the type \[ u'' = f(t,u,u') \] and, more generally, of the types \[ (|u'|^{p-2}u')' = f(t,u,u'),\quad (r(t)u')' = f(t,u,u'), \quad (k(u)u')' = f(t,u,u') \] subject to two-point and to functional nonlinear boundary conditions.