A nonlinear complementarity problem in mathematical programming in Banach space
Mokhtar S. Bazaraa, Jamie J. Goode, M. Zuhair Nashed · Proceedings of the American Mathematical Society · 1972
An existence and uniqueness theorem for the nonlinear complementarity problem over closed convex cones in a reflexive real Banach space is established, using perturbations of solutions of variational inequalities and monotonicity methods.