## Decomposition branch and bound method for globally solving linearly constrained indefinite quadratic minimization problems.(English)Zbl 0858.90102

Summary: A decomposition branch-and-bound approach is considered for the global minimization of an indefinite quadratic function over a polytope. The objective function is a sum of a nonseparable convex part and a separable concave part. In many large-scale problems the number of convex variables is much larger than that of concave variables. Taking advantage of this we use a branch-and-bound method where branching proceeds by rectangular subdivision of the subspace of concave variables. With the help of an easily constructed convex underestimator of the objective function, a lower bound is obtained by solving a convex quadratic programming problem. Three variants using exhaustive, adaptive and $$w$$-subdivision are discussed. Computational results are presented for problems with 10-20 concave variables and up to 200 convex variables.

### MSC:

 90C20 Quadratic programming 90C25 Convex programming
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### References:

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