Necessary optimality conditions with a modified subdifferential
Xiaoqi Yang, B. D. Craven · Optimization · 1991
The concepts of the τ-subgradient and τ-subdifferential are introduced for local Lipschitz functions. It is proved that the generalized invex functions have a nonempty τ-subdifferential. The generalized directional derivate related to the τ-subdifferential is given. The necessary conditions of inequality constrained problems are clarified by the τ-subdifferential.