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Physical Sciences and Mathematics Commons

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Mathematics and Statistics Faculty Publications

2009

Generalized shifts; backward shifts; forward shifts; Cartesian products; subspaces; Banach spaces; strictly convex; totally incomparable; isometrically incomparable;reflexive Banach spaces

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Generalized Shifts On Cartesian Products, M. Rajagopalan, K. Sundaresan Jun 2009

Generalized Shifts On Cartesian Products, M. Rajagopalan, K. Sundaresan

Mathematics and Statistics Faculty Publications

It is proved that if E, F are infinite dimensional strictly convex Banach spaces totally incomparable in a restricted sense, then the Cartesian product E×F with the sum or sup norm does not admit a forward shift. As a corollary it is deduced that there are no backward or forward shifts on the Cartesian product`p1×`p2,1< p16=p2<∞, with the supremum norm thus settling a problem left open in Rajagopalan and Sundaresan in J. Analysis 7 (1999(, 75-81 and also a problem stated as unsolved in Rassias and Sundaresan.