Phillips symmetric operators and their extensions
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DOI: 10.1215/17358787-2018-0009
Abstract: Let $S$ be a symmetric operator with equal defect numbers and let $\mathfrak{U}$ be a set of unitary operators in a Hilbert space $\mathfrak{H}$. The operator $S$ is called $\mathfrak{U}$-invariant if $US=SU$ for all $U\in\mathfrak{U}$.… read more here.
Keywords: symmetric operators; mathfrak invariant; symmetric operator; phillips symmetric ... See more keywords