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On Eigenvalues of Pseudo‐Differential Operators
Author(s) -
Wong M. W.
Publication year - 1987
Publication title -
bulletin of the london mathematical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.396
H-Index - 48
eISSN - 1469-2120
pISSN - 0024-6093
DOI - 10.1112/blms/19.1.63
Subject(s) - mathematics , eigenvalues and eigenvectors , spectrum (functional analysis) , pure mathematics , differential operator , differential (mechanical device) , matrix differential equation , mathematical analysis , differential equation , physics , quantum mechanics , engineering , aerospace engineering
Conditions are given to ensure the existence of finitely many eigenvalues on the left‐hand side of the bottom of the essential spectrum. Estimates for the number of such eigenvalues are also discussed.