Table of Contents

Defining algebraic intersections.- Genre des courbes de l'espace projectif.- Deformation and stratification of secant structure.- Depth inequalities for complexes.- A generalized trisecant lemma.- Deformations of curves I moduli for hyperelliptic curves.- Double coverings and surfaces of general type.- Some formulas for a surface in—3.- Un theoreme de structure locale pour les complexes parfaits.