Proceedings of the National Academy of Sciences of the United States of America, Vol. 54, No. 2 (Aug. 15, 1965), pp. 337-342 (6 pages) ...
Let T = H + iK be hyponormal and 𝜑 be a strictly monotone increasing continuous function on σ(H). We define $\tilde{\varphi}(T)$ by $\tilde{\varphi}(T)=\varphi (H)+iK$. In this paper, we show that if ...
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