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A D. C. optimization algorithm for solving the trust-region subproblem. (English) Zbl 0913.65054
The authors consider the optimization problem \[ g(x)- h(x)\to \inf_{x\in\mathbb{R}^n}, \] where the functions \(g\) and \(h\) are convex. For this d.c. optimization problem, the authors give duality, local and global optimization conditions and a numerical algorithm. The given algorithm is applied for the solution of a trust-region problem of the form \[ {1\over 2}\cdot x^T\cdot A\cdot x+ b^T\cdot x\to \inf_{\| x\|\leq r}. \] Numerical experiments are given and relations to the Goldstein-Levitin-Polyak gradient projection algorithm in the convex case are discussed.

65K05 Numerical mathematical programming methods
90C26 Nonconvex programming, global optimization
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