Geodesic
On the semi-Browder spectrum
Vladimír Kordula ;  ; 
Studia Mathematica, Tome 123 (1997) no. 1, pp. 1-13
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An operator in a Banach space is called upper (lower) semi-Browder if it is upper (lower) semi-Fredholm and has a finite ascent (descent). We extend this notion to n-tuples of commuting operators and show that this notion defines a joint spectrum. Further we study relations between semi-Browder and (essentially) semiregular operators. 
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Vladimír Kordula;  ;  . On the semi-Browder spectrum. Studia Mathematica, Tome 123 (1997) no. 1, pp. 1-13. doi: 10.4064/sm-123-1-1-13

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