نتایج جستجو برای: numerical ranges

تعداد نتایج: 384945  

Journal: :Linear Algebra and its Applications 2006

Journal: :Bulletin of the Australian Mathematical Society 1975

Journal: :Proceedings of the Edinburgh Mathematical Society 1985

Journal: :Linear Algebra and its Applications 2005

Journal: :Tohoku Mathematical Journal 1967

Journal: :Annals of Functional Analysis 2015

Journal: :Applied Mathematics Letters 2010

2004
E B Davies

We describe how to obtain bounds on the spectrum of a non-self-adjoint operator by means of what we call its higher order numerical ranges. We prove some of their basic properties and describe explain how to compute them. We finally use them to obtain new spectral insights into the non-selfadjoint Anderson model in one and two space dimensions. keywords: non-self-adjoint operator, spectrum, num...

2008
Chi-Kwong Li

For a noisy quantum channel, a quantum error correcting code exists if and only if the joint higher rank numerical ranges associated with the error operators of the channel is non-empty. In this paper, geometric properties of the joint higher rank numerical ranges are obtained and their implications to quantum computing are discussed. It is shown that if the dimension of the underlying Hilbert ...

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