Commentary on: [L 49] Simplified Proof of the Expansions Theorem for Singular Second Order Linear Differential Equations [L 51] (with E. A. Coddington), On the Nature of the Spectrum of Singular Second Order Linear Differential Equations [L 59] The Expansion Theorem for Singular Self-Adjoint Linear Differential Operators
2018 ◽
Vol 130
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pp. 213-228
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1973 ◽
Vol 6
(4)
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pp. 603-606
1986 ◽
Vol 17
(2)
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pp. 422-450
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Keyword(s):
1991 ◽
Vol 7
(4)
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pp. 354-359
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1968 ◽
Vol 79
(1)
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pp. 391-398
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Keyword(s):