Drazin invertibility of sum and product of closed linear operators

MESSIRD, Bekkai; MESSIRDI, Sanaa; MESSIRDI, Miloud

dc.contributor.author	MESSIRD, Bekkai
dc.contributor.author	MESSIRDI, Sanaa
dc.contributor.author	MESSIRDI, Miloud
dc.date.accessioned	2019-06-24T10:28:52Z
dc.date.available	2019-06-24T10:28:52Z
dc.date.issued	2014
dc.identifier.uri	http://e-biblio.univ-mosta.dz/handle/123456789/11102
dc.description.abstract	The paper present a survey of results concerning the fundamental properties of the Drazin inverse for bounded operators and an interesting study of the Drazin inverse for a closed operator in a Banach space. Some necessary and sufficient conditions for A closed linear operator to possess a Drazin inverse AD are given, we obtain also a useful caracterization and explicit formula for the Drazin inverse (A+ B) D and (AB) D if A and B are closed operators.	en_US
dc.publisher	Malaya Journal of Matematik	en_US
dc.title	Drazin invertibility of sum and product of closed linear operators	en_US
dc.type	Article	en_US