Jean-Baptiste Hiriart-Urruty is a Professor of Mathematics at Universite Paul Sabatier, Toulouse France, Werner Oettli is a Professor of Mathematics at Universitat Mannhelm, Germany, Josef Stoeris a Professor of Applied Mathematics at Universitat Wurzburg, Germany.

• I: Theory 1. Hypertangent Cones for a Special Class of Sets 2. Optimization by Level Set Methods I : Duality Formulae 3. A Generalized Concept of Conjugation 4. Well-Posed Saddle Point Problems 5. Continuity Properties of Performance Functions 6. On a General Formulation of the Hahn-Banach Principle with Application to Optimization Theory 7. A Note on the Chebyshev e-Approximation Problem II: Algorithms 8. A Multiple Exchange Algorithm in Convex Programming 9. Algorithmes Pour Extraire Une Sous-Suite Convergente D'UNE Suite Non Convergente 10. The n-Step Square Convergence of Some Minimization Algorithms Related to Powell's Derivative Free Method III: Applications 11. Optimal Reconstruction of Surfaces Using Parametric Spline Functions 12. On the Penalty Method for Constrained Variational Inequalities 13. Bang-Bang-Controls for Time-Optimal Parabolic Boundary Control Problems with Integral State Constraints 14. Static and Dynamic Loads, Pointwise Constraint in Structural Optimization 15. Estimation and Control in Finite State Discounted Dynamic Programming

Jean-Baptiste Hiriart-Urruty is a Professor of Mathematics at Universite Paul Sabatier, Toulouse France, Werner Oettli is a Professor of Mathematics at Universitat Mannhelm, Germany, Josef Stoeris a Professor of Applied Mathematics at Universitat Wurzburg, Germany.

• I: Theory 1. Hypertangent Cones for a Special Class of Sets 2. Optimization by Level Set Methods I : Duality Formulae 3. A Generalized Concept of Conjugation 4. Well-Posed Saddle Point Problems 5. Continuity Properties of Performance Functions 6. On a General Formulation of the Hahn-Banach Principle with Application to Optimization Theory 7. A Note on the Chebyshev e-Approximation Problem II: Algorithms 8. A Multiple Exchange Algorithm in Convex Programming 9. Algorithmes Pour Extraire Une Sous-Suite Convergente D'UNE Suite Non Convergente 10. The n-Step Square Convergence of Some Minimization Algorithms Related to Powell's Derivative Free Method III: Applications 11. Optimal Reconstruction of Surfaces Using Parametric Spline Functions 12. On the Penalty Method for Constrained Variational Inequalities 13. Bang-Bang-Controls for Time-Optimal Parabolic Boundary Control Problems with Integral State Constraints 14. Static and Dynamic Loads, Pointwise Constraint in Structural Optimization 15. Estimation and Control in Finite State Discounted Dynamic Programming