M -quasi-hyponormal composition operators

Pushpa R. Suri and N. Singh

International Journal of Mathematics and Mathematical Sciences, 1987, vol. 10, 1-3

Abstract:

A necessary and sufficient condition is obtained for M -quasi-hyponormal composition operators. It has also been proved that the class of M -quasi-hyponormal composition operators coincides with the class of M -paranormal composition operators. Existence of M -hyponormal composition operators which are not hyponormal; and M -quasihyponormal composition operators which are not M -hyponormal and quasi-hyponormal are also shown.

Date: 1987
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jijmms:604095

DOI: 10.1155/S0161171287000760

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