Journal of the Operations Research Society of China ›› 2014, Vol. 2 ›› Issue (3): 341-350.doi: 10.1007/s40305-014-0054-y
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Abstract:
In this paper, we improve Polyak’s local convexity result for quadratic transformations. Extension and open problems are also presented.
Key words: Convexity , Quadratic transformation , Joint numerical range
Yong Xia. On Local Convexity of Quadratic Transformations[J]. Journal of the Operations Research Society of China, 2014, 2(3): 341-350.
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URL: https://www.jorsc.shu.edu.cn/EN/10.1007/s40305-014-0054-y
https://www.jorsc.shu.edu.cn/EN/Y2014/V2/I3/341
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