1988-91: Teacher in Mathematics in Ivory Cost.

1994-95: Junior Lecturer at the University of Tours (France). Teaching: Mechanics of the point in second year of course. Fourier sequences, Fourier Transformation, distribution, Hilbert Spaces, Laplace Transformation.

1996-99: Junior Lecturer at UCAD (University Cheikh Anta Diop). Teaching: Mathematical Analysis, Algebra, Operation Research: linear programming, Theory of Games, Graphs theory, Boolean Algebra. Mathematical of decision: Convex analysis, convex

programming, Optimization, calculus.

1999-00: Senior lecturer at the UCAD.Teaching: Operation research, Mathematical of decision , Mathematical analysis.

Research

4. M. Ndiaye, H. Giacomini, __Quadratic systems equivalent by domain to a linear one: Global phase portrait__, Extrata Matematica, **15** (2000) numero 1

3. Ndiaye, Malick; Michelot, Christian __A geometrical construction of the set of strictly efficient points in the polyhedral norm case__. Proceedings of the 9th Meeting of the EURO Working Group on Locational Analysis (Birmingham, 1996). Stud. Locat. Anal. No. 11 (1997), 89--99.

2. H. Giacomini, M. Ndiaye, __New sufficient conditions for a center and global Phase portraits for polynomial systems__. Publ. Mat , **40** (1996), 351-372.

1.H. Giacomini, M. Ndiaye, __Sufficient conditions for the existence of a center in polynomial systems of arbitrary degree__. Publ. Mat., **40** (1996),205-214.