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THE EXPLICIT REPRESENTATIONS OF THE DRAZIN INVERSES OF A CLASS OF BLOCK MATRICES

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ELA

THE EXPLICIT REPRESENTATIONS OF THE DRAZIN INVERSES OF A CLASS OF BLOCK MATRICES

CHANGJIANG BU AND KUIZE ZHANG

Abstract. Let M = A BC D

be a 2×2 block matrix, where ABC= 0 and eitherDC = 0 or BD = 0. This paper gives the explicit representations ofMD in terms of A, B, C, D, AD,(BC)D andDD.

Key words. Block matrix, Drazin inverse, Index.

AMS subject classifications.15A09, 65F20.

Received by the editors April 17, 2009. Accepted for publication July 22, 2010. Handling Editor:

Michael Neumann.

Dept. of Applied Math., College of Science, Harbin Engineering University, Harbin 150001, P. R.

China ([email protected], [email protected]). Supported by Natural Science Foundation of the Heilongjiang province, No.159110120002.

Electronic Journal of Linear Algebra ISSN 1081-3810 A publication of the International Linear Algebra Society Volume 20, pp. 406-418, July 2010

http://math.technion.ac.il/iic/ela

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