Geodesic
A topological characterization of the product of two closed operators
Bekkai Messirdi1 ; Mohammed Hichem Mortad1 ; Abdelhalim Azzouz2 ; Ghouti Djellouli2
1 Département de Mathématiques Université d'Oran (Es-senia) B.P. 1524, El Menouar Oran 31000, Algeria
2 Département de Mathématiques Centre Universitaire de Saïda Saïda 20000, Algeria
Colloquium Mathematicum, Tome 112 (2008) no. 2, pp. 269-278 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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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.
DOI : 10.4064/cm112-2-4
Keywords: purpose work topological condition usual product closed operators acting hilbert space closed

Bekkai Messirdi 1 ; Mohammed Hichem Mortad 1 ; Abdelhalim Azzouz 2 ; Ghouti Djellouli 2

1 Département de Mathématiques Université d'Oran (Es-senia) B.P. 1524, El Menouar Oran 31000, Algeria
2 Département de Mathématiques Centre Universitaire de Saïda Saïda 20000, Algeria 
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Bekkai Messirdi; Mohammed Hichem Mortad; Abdelhalim Azzouz; Ghouti Djellouli. A topological characterization of the
 product of two closed operators. Colloquium Mathematicum, Tome 112 (2008) no. 2, pp. 269-278. doi: 10.4064/cm112-2-4

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