Abstract. We reprove a recent result of Z. Sebestyén and Zs. Tarcsay [9]: If $T^*T$ and $TT^*$ are self-adjoint, then $T$ is closed.
DOI: 10.14232/actasm-018-295-y
AMS Subject Classification
(1991): 47B25; 47B65
Keyword(s):
von Neumann's theorem
Received May 10, 2018. (Registered under 45/2018.)
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