Our aim in this article is to study the class of so-called rho-paraconv ex multifunctions from a Banach space X into the subsets of another Banach space Y. These multifunctions are defined in relation with a modulus f...
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Our aim in this article is to study the class of so-called rho-paraconv ex multifunctions from a Banach space X into the subsets of another Banach space Y. These multifunctions are defined in relation with a modulus function rho : X -> [0, +infinity) satisfying some suitable conditions. This class of multifunctions generalizes the class of gamma-paraconvex multifunctions with gamma > 1 introduced and studied by Rolewicz, in the eighties and subsequently studied by A. Jourani and some others authors. We establish some regular properties of graphical tangent and normal cones to paraconvex multifunctions between Banach spaces as well as a sum rule for coderivatives for such class of multifunctions. The use of subdifferential properties of the lower semicontinuous envelope function of the distance function associated to a multifunction established in the present paper plays a key role in this study.
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