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- W2331567735 abstract "Let H be a Hilbert space with inner product 〈,). A well-known theorem of von Neumann states that, if S is a symmetric operator in H, then S has a selfadjoint extension in H if and only if S has equal deficiency indices. This result was extended by Naimark, who proved that, even if the deficiency indices of S are unequal, there always exists a Hilbert space H 1 such that H ⊆ H 1 and S has a selfadjoint extension in H 1 ." @default.
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- W2331567735 date "1973-09-01" @default.
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- W2331567735 title "Finite-Dimensional Extensions of Certain Symmetric Operators(1)" @default.
- W2331567735 doi "https://doi.org/10.4153/cmb-1973-076-6" @default.
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