Journal of the Operations Research Society of China >
On Local Convexity of Quadratic Transformations
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 . DOI: 10.1007/s40305-014-0054-y
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