Geodesic
On the $\stackrel{\sharp}{\le}$-Order on the Set of Linear Bounded Operators in Banach Space
Matematičeskie zametki, Tome 93 (2013) no. 5, pp. 794-797.

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Keywords: linear bounded operator, Banach space, matrix $\stackrel{\sharp}{\le}$-order, matrix $A\mathbin{\overline{\le}}B$-order, index of a matrix, Hilbert space, idempotent.
Mots-clés : group inverse matrix 
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M. A. Efimov. On the $\stackrel{\sharp}{\le}$-Order on the Set of Linear Bounded Operators in Banach Space. Matematičeskie zametki, Tome 93 (2013) no. 5, pp. 794-797. http://geodesic.mathdoc.fr/item/MZM_2013_93_5_a14/

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