Abstract
In this paper we establish a basic theory on the connectivity of quadratic hypersurfaces. In addition, we examine how both the connectivity and the hidden convexity of quadratic functions are related to each other and prove several connectivity theorems on quadratic functions that combine and generalize Dines's and Brickman's results on the hidden convexity of quadratic mappings in real field. Many classical results in quadratic optimization are reproved by the unified approach, and more properties involving the matrix pencils are given.
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