Drazin invertibility of sum and product of closed linear operators
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DOI:
https://doi.org/10.26637/mjm204/014Abstract
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 \(A^D\) are given, we obtain also a useful caracterization and explicit formula for the Drazin inverse \((A+B)^D\) and \((A B)^D\) if \(A\) and \(B\) are closed operators.
Keywords:
Drazin inverse, Closed linear operators, Gap metricMathematics Subject Classification:
47A05, 47B33- Pages: 472-481
- Date Published: 01-10-2014
- Vol. 2 No. 04 (2014): Malaya Journal of Matematik (MJM)
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