Abstract
The main objective of this paper is to provide a range-type criterion for the self-adjointness of symmetric linear relations in real or complex Hilbert spaces. The main used ingredient is a matrix whose entries are certain linear relations.
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Sandovici, A. A range matrix-type criterion for the self-adjointness of symmetric linear relations. Acta Math. Hungar. 158, 27–35 (2019). https://doi.org/10.1007/s10474-018-0883-y
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DOI: https://doi.org/10.1007/s10474-018-0883-y