Boundedness of composition operators from Lorentz spaces to Orlicz spaces

The boundedness (continuity) of composition operators from some function space to another one is significant, though there are few results about this problem. Thus, in this study, we provide necessary and sufficient conditions on the boundedness of composition operators from Lorentz spaces to Orlicz spaces. We emphasize that the measure spaces associated with the Lorentz space may be different from those associated with the Orlicz spaces. Moreover we give some examples and counterexamples of the composed mappings in the conditions.