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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1948 Dec;34(12):594–601. doi: 10.1073/pnas.34.12.594

The Rayleigh-Ritz and the Weinstein Methods for Approximation of Eigenvalues

II. Differential Operators

N Aronszajn 1
PMCID: PMC1079175  PMID: 16588840

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