opisometeropponentopportunity costopportunity curveopportunity lossopportunity studiesopposeoppositeopposite anglesopposite arrowopposite numberopposite ofopposite orientationopposite sense inequalitiesopposite sidesopposite vectoroppositelyoppositionopticaloptical comparatoroptical property of conicsoptical property of coniesopticsoptimaloptimal basic feasible solutionoptimal basisoptimal block designoptimal bounded variablesoptimal controloptimal control problemoptimal decisionoptimal extreme pointoptimal feasible solutionoptimal frequencyoptimal location problem nonbasicoptimal pointoptimal policyoptimal solutionoptimal strategyoptimal systemoptimalityoptimality atoptimality conditionoptimality conditions criterion nonbasicoptimality criterionoptimalizeoptimisticoptimistic estimateoptimistic timeoptimization