La Classification Mathématique par matières 2000 Mathematics subject Classification 2000 Query : CC = 90C46 90-XX Operations research, mathematical programming 90C46 Optimality conditions, duality [See also 49N15] [New MSC 2000 code] MSC 1991 codes in relation : 90C30, 49N15 Keyword : Back to the Mathematics Subject Classification (version 2000)