A formula on the approximate subdifferential of the difference of convex functions
Juan Enrique Martínez-Legaz, Alberto Seeger · Bulletin of the Australian Mathematical Society · 1992
We give a formula on the ε−subdifferential of the difference of two convex functions. As a by-product of this formula, one recovers a recent result of Hiriart-Urruty, namely, a necessary and sufficient condition for global optimality in nonconvex optimisation.