QUANTUM ERASER ENTANGLEMENT REFORMULATION MINIMIZATION WHIT EQUILIBRIUM CONSTRAINT SOLIDAGO GIGANTEA INEQUAÇÕES VARIACIONAIS MIXED COMPLEMENTARITY PROBLEM BOX CONSTRAINED BOUNDED LEVEL SET COMPETITION COULOMB FRICTION TROPHIC GROUPS ECOSYSTEM FUNCTIONING BIOTIC RESISTANCE CONE BOX CONSTRAINED OPTIMIZATION BIODIVERSITY CONTACT PROBLEM NONLINEAR SYSTEM LORENTZ CONE UNSCONSTRAINED OPTIMIZATION MULTIFUNCTIONALITY VARIATIONAL INEQUALITIES FRESHWATER ECOSYSTEMS