A topological characterization of the
 product of two closed operators

Bekkai Messirdi; Mohammed Hichem Mortad; Abdelhalim Azzouz; Ghouti Djellouli

doi:10.4064/cm112-2-4

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A topological characterization of the product of two closed operators

Volume 112 / 2008

Bekkai Messirdi, Mohammed Hichem Mortad, Abdelhalim Azzouz, Ghouti Djellouli Colloquium Mathematicum 112 (2008), 269-278 MSC: Primary 47A05. DOI: 10.4064/cm112-2-4

Abstract

The purpose of this work is to give a topological condition for the usual product of two closed operators acting in a Hilbert space to be closed.

Authors

Bekkai MessirdiDépartement de Mathématiques
Université d'Oran (Es-senia)
B.P. 1524, El Menouar
Oran 31000, Algeria
e-mail
e-mail
Mohammed Hichem MortadDépartement de Mathématiques
Université d'Oran (Es-senia)
B.P. 1524, El Menouar
Oran 31000, Algeria
e-mail
e-mail
Abdelhalim AzzouzDépartement de Mathématiques
Centre Universitaire de Saïda
Saïda 20000, Algeria
e-mail
Ghouti DjellouliDépartement de Mathématiques
Centre Universitaire de Saïda
Saïda 20000, Algeria
e-mail

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