Pınar, M. Ç.2016-02-082016-02-0820040022-3239http://hdl.handle.net/11693/24245We prove a sufficient global optimality condition for the problem of minimizing a quadratic function subject to quadratic equality constraints where the variables are allowed to take values -1 and 1. We extend the condition to quadratic problems with matrix variables and orthonormality constraints, and in particular to the quadratic assignment problem.EnglishGlobal optimalityQuadratic assignment problemQuadratic optimization with binary variablesSufficient optimality conditionsArticle10.1023/B:JOTA.0000042530.24671.801573-2878