Semi-Browder operators and perturbations

Tom 122 / 1997

Vladimir Rakočević Studia Mathematica 122 (1997), 131-137 DOI: 10.4064/sm-122-2-131-137

Streszczenie

An operator in a Banach space is called upper (resp. lower) semi-Browder if it is upper (lower) semi-Fredholm and has a finite ascent (resp. descent). An operator in a Banach space is called semi-Browder if it is upper semi-Browder or lower semi-Browder. We prove the stability of the semi-Browder operators under commuting Riesz operator perturbations. As a corollary we get some results of Grabiner [6], Kaashoek and Lay [8], Lay [11], Rakočević [15] and Schechter [16].

Autorzy

  • Vladimir Rakočević

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