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Product numerical range

Known as: Local numerical range 
Given a Hilbert space with a tensor product structure a product numerical range is defined as a numerical range with respect to the subset of product… 
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Papers overview

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2014
2014
A local numerical range is analyzed for a family of circulant observables and states of composite $2 \otimes d$ systems. It is… 
2010
2010
Local numerical range is analyzed for a family of circulant observables and states of composite 2 ⊗ d systems. It is shown that… 
1976
1976
The numerical range of an unbounded linear operator on a complex Banach space is the whole complex plane. Let X denote a Banach…