Exact penalization via dini and hadamard conditional derivatives
Vladimir F. Demyanov, Gianni Di Pillo, Francisco Facchinei · Optimization methods & software · 1998
Exact penalty functions for nonsmooth constrained optimization problems are analyzed tfy using the notion of (Dini) Hadamard directional derivative with respect to the constraint set. Weak conditions are given guaranteeing equivalence of the sets of stationary, global minimum, local minimum points of the constrained problem and of the penalty function