Abstract
This is a brief survey of M. G. Krein's contribution to the theory of self-adjoint extensions of Hermitian operators and to the theory of boundary-value problems for differential equations. The further development of these results is also considered.
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 46, Nos. 1–2, pp. 55–62, January–February, 1994.
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Gorbachuk, M.L., Gorbachuk, V.I. Theory of self-adjoint extensions of symmetric operators. entire operators and boundary-value problems. Ukr Math J 46, 54–61 (1994). https://doi.org/10.1007/BF01057000
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DOI: https://doi.org/10.1007/BF01057000