Generalized directional derivatives and subgradients of nonconvex functions. (English) Zbl 0447.49009
MSC:
49J45 | Methods involving semicontinuity and convergence; relaxation |
26B25 | Convexity of real functions of several variables, generalizations |
26B05 | Continuity and differentiation questions |
26B12 | Calculus of vector functions |