We obtain a Cartesian form of Putnam's inequality for doubly commuting hyponormal n-tuples, and we establish new relations between the Taylor and Xia spectra of such n-tuples.
Proceedings of the American Mathematical Society, Vol. 34, No. 1 (Jul., 1972), pp. 71-72 (2 pages) Let $S, A_1, A_2, \cdots, A_p$ be finite nonempty sets of $n ...
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