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Operators in Rigged Hilbert Spaces, Gel’fand Bases and Generalized Eigenvalues

Author

Listed:
  • Jean-Pierre Antoine

    (Institut de Recherche en Mathématique et Physique, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium)

  • Camillo Trapani

    (Dipartimento di Matematica e Informatica, Università degli Studi di Palermo, Via Archirafi n. 34, I-90123 Palermo, Italy)

Abstract

Given a self-adjoint operator A in a Hilbert space H , we analyze its spectral behavior when it is expressed in terms of generalized eigenvectors. Using the formalism of Gel’fand distribution bases, we explore the conditions for the generalized eigenspaces to be one-dimensional, i.e., for A to have a simple spectrum.

Suggested Citation

  • Jean-Pierre Antoine & Camillo Trapani, 2022. "Operators in Rigged Hilbert Spaces, Gel’fand Bases and Generalized Eigenvalues," Mathematics, MDPI, vol. 11(1), pages 1-11, December.
  • Handle: RePEc:gam:jmathe:v:11:y:2022:i:1:p:195-:d:1019844
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