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Application of degree theory in stability of the complementarity problem. (English) Zbl 0616.90082
We study the behavior of a solution of the complementarity problem when the problem is perturbed. The basic result is that if the degree of a certain function is nonzero then the problem is stable. We show that several well-known conditions for the existence of a solution to the problem also imply stability of the problem. We also show that in the nondegenerate case there are simple conditions that ensure stability.

90C33 Complementarity and equilibrium problems and variational inequalities (finite dimensions) (aspects of mathematical programming)
90C31 Sensitivity, stability, parametric optimization
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