Über die Selbstadjungiertheit von Schrödinger Operatoren.
Ultrapowers of unbounded selfadjoint operators
Unbounded Hermitian operators and relative reproducing kernel Hilbert space
We study unbounded Hermitian operators with dense domain in Hilbert space. As is known, the obstruction for a Hermitian operator to be selfadjoint or to have selfadjoint extensions is measured by a pair of deficiency indices, and associated deficiency spaces; but in practical problems, the direct computation of these indices can be difficult. Instead, in this paper we identify additional structures that throw light on the problem. We will attack the problem of computing deficiency spaces for a single...
Unbounded Toeplitz operators in the Bargmann-Segal space