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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
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