THE EIGENFUNCTION EXPANSION THEOREM FOR THE GENERAL SELF-ADJOINT SINGULAR ELLIPTIC PARTIAL DIFFERENTIAL OPERATOR. I. THE ANALYTICAL FOUNDATION

. 1954 Jun;40(6):454–459. doi: 10.1073/pnas.40.6.454

THE EIGENFUNCTION EXPANSION THEOREM FOR THE GENERAL SELF-ADJOINT SINGULAR ELLIPTIC PARTIAL DIFFERENTIAL OPERATOR. I. THE ANALYTICAL FOUNDATION^¹

PMCID: PMC534069 PMID: 16589505

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Browder F. E. The Dirichlet Problem for Linear Elliptic Equations of Arbitrary Even Order with Variable Coefficients. Proc Natl Acad Sci U S A. 1952 Mar;38(3):230–235. doi: 10.1073/pnas.38.3.230. [DOI] [PMC free article] [PubMed] [Google Scholar]
Mautner F. I. On Eigenfunction Expansions. Proc Natl Acad Sci U S A. 1953 Jan;39(1):49–53. doi: 10.1073/pnas.39.1.49. [DOI] [PMC free article] [PubMed] [Google Scholar]