Author
Muneo Chō
Bio: Muneo Chō is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.
Papers
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01 Jan 1986
TL;DR: For a doubly commuting n-tuple of quasinormal operators, it was shown in this article that 5(T A) = d(A, a, (T)) and r, r, T A = I IDT II.
Abstract: In [5], Salinas asked the following question: If T = (Ti,.. , Tn) consists of commuting hyponormal operators, is it true that (1) 5(T A) = d(A, a, (T)) and (2) r, (T) = I IDT II? He proved that, for a doubly commuting n-tuple of quasinormal operators, (2) was true and (1) was true for A = 0. In this paper we shall show that (2) holds for a doubly commuting n-tuple of hyponormal operators and give an example of a subnormal operator which does not satisfy (1).
2 citations
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TL;DR: In this article, a class of completely hyperexpansive tuples of finite order is introduced, which is in some sense antithetical to the notion of completely hypercontractive tuplands of finite orders.
7 citations