Geodesic
Operational quantities characterizing semi-Fredholm operators
Studia Mathematica, Tome 114 (1995) no. 1, pp. 13-27

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Several operational quantities have appeared in the literature characterizing upper semi-Fredholm operators. Here we show that these quantities can be divided into three classes, in such a way that two of them are equivalent if they belong to the same class, and are comparable and not equivalent if they belong to different classes. Moreover, we give a similar classification for operational quantities characterizing lower semi-Fredholm operators.
DOI : 10.4064/sm-114-1-13-27
Keywords: operational quantity, semi-Fredholm operator

Manuel González 1

1 
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Manuel González. Operational quantities characterizing semi-Fredholm operators. Studia Mathematica, Tome 114 (1995) no. 1, pp. 13-27. doi: 10.4064/sm-114-1-13-27

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