Smoothing trust region methods for nonlinear complementarity problems with PO-functions

By using the Fischer-Burmeister function to reformulate the nonlinear complementarity problem (NCP) as a system of semismooth equations and using Kanzow's smooth approximation function to construct the smooth operator, we propose a smoothing trust region algorithm for solving the NCP with PO functions. We prove that every accumulation point of the sequence generated by the algorithm is a solution of the NCP. Under a nonsingularity condition, local Q-superlinear/Q-quadratic convergence of the algorithm is established without the strict complementarity condition.