Displaying similar documents to “Semi-riemannian Manifolds Whose Weyl Tensor is a Kulkarni--nomizu Square”

On the semi-Browder spectrum

Vladimír Kordula, Vladimír Müller, Vladimir Rakočević (1997)

Studia Mathematica

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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.