Krein-Visik-Birman self-adjoint extension theory revisited

Abstract
The core results of the so-called KreIn-Visik-Birman theory of self-adjoint extensions of semi-bounded symmetric operators are reproduced, both in their original and in a more modern formulation, within a comprehensive discussion that includes missing details, elucidative steps, and intermediate results of independent interest.
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Keywords
Self-adjoint operators, self-adjoint extensions, von Neumann extension theory, Krein-Visik-Birman extension theory
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