Fredholm Spectra and Weyl Type Theorems for Drazin Invertible Operators

Pseudo-Inverses in Associative Rings and Semigroups

Michael P. Drazin · American Mathematical Monthly · 1958 · 698 citations

Natural Sciences, Mathematics, Algebra +10

Pseudo-Inverses in Associative Rings and Semigroups

Michael P. Drazin · American Mathematical Monthly · 1958 · 293 citations

Natural Sciences, Mathematics, Algebra +10

On the axiomatic theory of spectrum II

Studia Mathematica · 1996 · 141 citations · Full text

Natural Sciences, Mathematics, Set Theory +8

Weyl Type Theorems for Left and Right Polaroid Operators

Pietro Aiena, Elvis Aponte, Edixon Balzan · Integral Equations and Operator Theory · 2010 · 88 citations

Natural Sciences, Mathematics, Algebra +8

Variations on Weyl's theorem

Pietro Aiena, Pedro Peña · Journal of Mathematical Analysis and Applications · 2006 · 88 citations · Full text

Natural Sciences, Philosophy, Theoretical Physics +3