Wai-Shun Cheung

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20142019

most citedAn upper bound on the dimension of the voting system of the European Union Council under the Lisbon rules

2 citations · 2 across the 4 of their papers we have counts for

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math.FA2016

New pairs of matrices with convex generalized numerical ranges

Wai-Shun Cheung

In this article, we are going to search for $n \times n$ matrices $A$ and $B$ such that their generalized numerical range $W_{A} (B) = {t r (A U^{*} B U) : U^{*} U = U U^{*} = I}$ is convex. More…

math.FA2014

On the boundary of weighted numerical ranges

Wai-Shun Cheung

In this article, we are going to introduce the weighted numerical range which is a further generalization both the c-numerical range and the rank k numerical range. If the boundari…