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    题名: Numerical radius inequality for C-0 contractions
    作者: Wu,PY;Gau,HL;Tsai,MC
    贡献者: 數學研究所
    关键词: MAPPING THEOREMS;RANGE;PRODUCT
    日期: 2009
    上传时间: 2010-06-29 19:38:48 (UTC+8)
    出版者: 中央大學
    摘要: We show that if A is a C-0 contraction with minimal function phi such that w(A) = w(S(phi)), where w(.) denotes the numerical radius of an operator and S(phi) is the compression of the shift on (HH2)-H-2 circle minus phi, and B commutes with A, then w(AB) <= w(A)parallel to B parallel to. This is in contrast to the known fact that if A = S(phi) (even on dimensional space) and B commutes with A, then w(AB) <= w parallel to A parallel to w(B) is not necessarily true. As a a finite consequence, we have w(AB) <= w(A)parallel to B parallel to for any quadratic operatorA and any B commuting with A. (c) 2007 Elsevier Inc. All rights reserved.
    關聯: LINEAR ALGEBRA AND ITS APPLICATIONS
    显示于类别:[數學研究所] 期刊論文

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