Approximation and Optimization : Proceedings of the International Seminar held in Havana Cuba Jan. 12–16 1987 Nonparametric polynomial density estimation in the L P norm Local spline interpolation schemes in one and several variables On the rate of rational approximation of analytic functions Parametric optimization: Pathfollowing with jumps Optimization problems in the robustness analysis of linear state space systems A principle of contamination in best polynomial approximation Nearby sets and centers Approximation by lipschitz functions and its application to boundary value of cauchy type integrals Asymptotics for the ratio of the leading coefficients of orthogonal polynomials associated with a jump modification Convergence of pade approximats in a non commutative algebra Subsets of unicity in uniform approximation On qualitative Korovkin theorems with a distance Relative asymptotics of orthogonal polynomials with respect to varying measures II On the rational approximation of HP functions in the LP() metric On the trajectories of inclined oil wells On some contributions of Halasz to the turan power sum theory On the m th row of newton type ( ) PADF tables and singllar points On simul taneous rational interpolants of type ( ) Généralisation de formules de bornage de L I et applications aux Lp On C0 semigroups in a space of bounded continuous functions in the case of entrance or natural boundary points On the approximation of Riemann integrable functions by bernstein polynomials Optimization criteria for multivariate strata construction Proof of two conjectures by G. Chen and D. L. Russell on structural damping for elastic systems An iterative aggregation algorithm for linear programming Optimal control of non linear retarded systems with phase constraints.