Atkinson's Theorem

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In operator theory, Atkinson''s theorem gives a characterization of Fredholm operators.Let H be a Hilbert space and L(H) the bounded operators on H. The following is the classical definition of a Fredholm operator: a T L(H) is said to be a Fredholm operator if the kernel of T Ker(T) is finite dimensional, Ker(T ) is finite dimensional, and the range of T Ran(T) is closed. Atkinson''s theorem states: A T L(H) is a Fredholm operator if and only if T is invertible modulo compact perturbation, i.e. TS = I + C1 and ST = I + C2 for some bounded operator S and compact operators C1 and C2. In other words, an operator T L(H) is Fredholm, in the classical sense, if and only if its projection in the Calkin algebra is invertible.

Weitere Informationen

  • Allgemeine Informationen
    • GTIN 09786131318474
    • Editor Lambert M. Surhone, Mariam T. Tennoe, Susan F. Henssonow
    • Größe H220mm x B220mm
    • EAN 9786131318474
    • Format Fachbuch
    • Titel Atkinson's Theorem
    • Herausgeber Betascript Publishing
    • Anzahl Seiten 68
    • Genre Mathematik

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