Gao, Yan; Deng, Mingrong Lagrange multipliers and first order optimality conditions for quasidifferentiable optimization. (Chinese. English summary) Zbl 0894.49011 J. Math. Res. Expo. 15, Suppl., 71-74 (1995). Summary: The equivalence of Fritz John’s necessary condition and Shapiro’s necessary condition for quasidifferentiable optimization is proved. Two sufficient optimality conditions for quasidifferentiable optimization are given. MSC: 49J52 Nonsmooth analysis 90C30 Nonlinear programming Keywords:nondifferentiable optimization; optimality conditions; quasidifferentiable optimization PDFBibTeX XMLCite \textit{Y. Gao} and \textit{M. Deng}, J. Math. Res. Expo. 15, 71--74 (1995; Zbl 0894.49011)