Table of contents : Proof of Schubert's conjectures on double contacts....Pages 1-29 Hilb 4 P 2 ....Pages 30-59 Schubert's coincidence formulas for line complexes and the contribution of embedded planar pencils....Pages 60-76 Local multiplicities of tangential trisecants to space curves....Pages 77-100 Multiple-point formulas II: The Hilbert scheme....Pages 101-138 Transversality criteria in any characteristic....Pages 139-150 Quelques formules multisécantes pour les surfaces....Pages 151-188 On Schubert's degenerations of cuspidal plane cubics....Pages 189-214 A characterization of balanced rational normal scrolls in terms of their osculating spaces....Pages 215-224 The Chow ring of Hilb 3 P 3 ....Pages 225-255 Rational equivalence theory on arbitrary noetherian schemes....Pages 256-297