关于正规矩阵的和
On the sum of normal matrices
摘要：
这篇短文回顾了Djoković [Proc.Amer.Math.Soc.27（1971）19-23]的一个显著但几乎被忽视的结果。一个连接的结果uSemrl指出。利用Djoković的结果，将Craig-Sakamoto定理推广到$k$（$k\ge 2$）正规矩阵.对最近的一个月度问题也作了评论。
英文摘要：
This short paper revisits a remarkable but almost overlooked result of Djoković [Proc. Amer. Math. Soc. 27 (1971) 19-23]. A connection to a result of uSemrl is pointed out. With Djoković's result, an extension of Craig-Sakamoto theorem to $k$ ($k\ge 2$) normal matrices is presented. A comment to a recent monthly problem is also given.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
