科研之友
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摘要
This note investigates the convexity of the indefinite joint numerical range of a tuple of Hermitian matrices in the setting of Krein spaces. Its main result is a necessary and sufficient condition for convexity of this set. A new notion of %26quot;quasi-convexity%26quot; is introduced as a refinement of pseudo-convexity.
- 出版日期2014-10
