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引用次数: 2
摘要
． 那是展示用的n≤3《联合numerical太阳城of a family of通勤是n×n情结matrices总是凸;为n≥4有两条通勤matrices一个关节numerical太阳城是凸音符。
. It is shown that for n ≤ 3 the joint numerical range of a family of commuting n × n complex matrices is always convex; for n ≥ 4 there are two commuting matrices whose joint numerical range is not convex.
期刊介绍：
The journal publishes original papers in English, French, German and Russian, mainly in functional analysis, abstract methods of mathematical analysis and probability theory.
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