The Composition Operator in Sobolev Morrey Spaces
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Keywords:
composition operator, Morrey space, Sobolev Morrey spaceAbstract
In this paper we prove sufficent conditions on a map \( f \) from the real line to itself in order that the composite map \( f \circ g \) belongs to a Sobolev Morrey space of real valued functions on a domain of the \( n \)-dimensional space for all functions \( g \) in such a space. Then we prove sufficient conditions on \( f \) in order that the composition operator \( T_f \) defined by \( T_f[g] \equiv f \circ g \) for all functions \( g \) in the Sobolev Morrey space is continuous, Lipschitz continuous and differentiable in the Sobolev Morrey space. We confine the attention to Sobolev Morrey spaces of order up to one.