Littlewood–Paley theory for Morrey spaces and their preduals

Abstract

Zorko proved that Morrey spaces are known to have preduals. In the present paper such predual spaces are shown to be characterized by means of the Littlewood–Paley operators. Recently, many function spaces are shown to admit the Littlewood–Paley characterization. As for the predual spaces of Morrey spaces, it had not been clear that a pointwise increasing norm-bounded sequence has a least bound. However, the author proved in the earlier paper that it actually has a least bound. In the present paper, by taking advantage of this property, a characterization by means of Littlewood–Paley operators is proposed.