Some NP-complete problems in quadratic and nonlinear programming
Mathematical Programming: Series A and B
On Copositive Programming and Standard Quadratic Optimization Problems
Journal of Global Optimization
A linear programming reformulation of the standard quadratic optimization problem
Journal of Global Optimization
An Augmented Primal-Dual Method for Linear Conic Programs
SIAM Journal on Optimization
Journal of Global Optimization
On the computational complexity of membership problems for the completely positive cone and its dual
Computational Optimization and Applications
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The cone of completely positive matrices C* is the convex hull of all symmetric rank-1-matrices xx T with nonnegative entries. While there exist simple certificates proving that a given matrix $${B\in C^*}$$ is completely positive it is a rather difficult problem to find such a certificate. We examine a simple algorithm which--for a given input B--either determines a certificate proving that $${B\in C^*}$$ or converges to a matrix $${\bar S}$$ in C* which in some sense is "close" to B. Numerical experiments on matrices B of dimension up to 200 conclude the presentation.