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$$(p,q)$$-convex functions. (Italian) Zbl 0521.49011

##### MSC:
 49J45 Methods involving semicontinuity and convergence; relaxation 26B25 Convexity of real functions of several variables, generalizations 49J20 Existence theories for optimal control problems involving partial differential equations 35F20 Nonlinear first-order PDEs 54A20 Convergence in general topology (sequences, filters, limits, convergence spaces, nets, etc.) 28A15 Abstract differentiation theory, differentiation of set functions