Thời gian: 13h, Thứ 2, ngày 13/4/2015

Địa điểm: Phòng 6, Nhà A14, Viện Toán học, 18 Hoàng Quốc Việt, Cầu Giấy, Hà Nội

Tóm tắt: The notion of s-quasiconvex function is presented  from  the paper “Stable Generalization of convex functions”  by H.X.Phu and P. T. An. These functions  are quasiconvex, expilicitly quasiconvex, and pseudoconvex if they are continuously differentiable. Especially, the s-quasiconvexity is stable with repect to the following important properties (P1) all power level sets are convex, (P2) each local minimum is global minimum is a global minimum, and (P3) each stationary point is a global minimizer.