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Abstract
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International Journal of Mathematics and Mathematical Sciences
Volume 2 (1979), Issue 1, Pages 29-34
doi:10.1155/S016117127900003X

Some results on composition operators on ℓ2

R.K. Singh , D.K. Gupta and B.S. Komal

Mathematics Department, University of Jammu, Jammu 180001, India

Abstract

A necessary and sufficient condition for a bounded operator to be a composition operator is investigated in this paper. Normal, quasi-hyponormal, paranormal composition operators are characterised.