Uniformly convex and smooth Banach spaces and L-boundedness properties of Littlewood-Paley and area functions associated with semigroups

Abstract In this paper we obtain new characterizations of the uniformly convex and smooth Banach spaces. These characterizations are established by using L p -boundedness properties of Littlewood-Paley functions and area integrals associated with heat semigroups and involving fractional derivatives. Our results apply for instance by considering the heat semigroups defined by Hermite and Laguerre operators that do not satisfy the Markovian property.