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Una generalizzazione degli operatori intermedi

  • Lucilla Bassotti Rizza
Conferenze
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Viene dato un procedimento per costruire una successione di operatori invertibili approssimanti un operatore assegnato, che generalizza il metodo degli operatori intermedi di Weinstein-Aronszajn.

Summary

A sequence of invertible operators, which approximate a given operator is here constructed. This result leads to a generalization of the known method of the intermediate operators due to Weinstein-Aronszajn.

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Bibliografia

  1. [1]
    Aronszajn N.,Approximation methods for eigenvalues of completely continuous symmetric operators, Proc. Symp. Spectral Theory and Differential Problems, Stillwater, Oklaoma, 1951.Google Scholar
  2. [2]
    Fichera G.,Linear elliptic differential systems and eigenvalue problems, Lecture Notes in Mathem.,8, Springer Verlag, Berlin-Heidelberg-New York, 1965.MATHGoogle Scholar
  3. [3]
    Fichera, G.,Upper bounds for orthogonal invariants of some positive linear operators, Rend. Ist. Mat. Univ. Trieste, 1969.Google Scholar
  4. [4]
    Weinstein A.Stenger W.,Methods of intermediate problems for eigenvalues, Academic Press, New York and London, 1972.MATHGoogle Scholar

Copyright information

© Birkhäuser-Verlag 1982

Authors and Affiliations

  • Lucilla Bassotti Rizza
    • 1
  1. 1.dell'Università di ParmaParmaItalia

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