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Product of matrical discs |
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| Authors: | T Ando F Kubo |
| Institution: | a Research institute for Electronic Science, Hokkaido University, Sapporo, Japan b Department of Mathematics, Toyama University, Toyama, Japan |
| Abstract: | We determine the matrical disc with minimal radius for the set of products XY when X and Y run over a (possibly distinct) matrical disc, respectively. Also we determine the union of the numerical ranges W(XY). |
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