Proceedings of a Symposium held July 30August 6, 1989, with support from the Danish Natural Science Research Council.;Conference held to celebrate the 150th anniversary of the birth of the Danish mathematician.

Includes bibliographical references.

Hieronymus Georg Zeuthen (18391920) ; How many smooth plane cubics with given nvariant are tangent to lines in general position? ; Triple and quadruple contact of plane curves ; Secant lines of smooth projective curves ; an infinitesimal study of the symmetric products ; New bounds for Fermat curves over finite fields ; Discriminants and limits of duals of plane curves ; On the inseparability of the Gauss map ; The BrillSegre formula for families of curves ; Duality for elliptic normal surface scrolls ; A note on the RiemannKempf theorem for curves ; On the geometry of nodal plane cubics: the condition ; Characteristic numbers of degeneracy loci ; On Halphen's first formula ; Negative intersection multiplicities on singular varieties ; Triple contact formulas in bf P^3 ; Elliptic quartic curves in a generic quintic threefold ; Characteristic numbers of plane curves: an excess intersection theoretical approach ; Degenerations of conormal varieties Steven L Kleiman ; Paolo Aluffi ; Susan Jane Colley and Gary Kennedy ; Marc Coppens and Trygve Johnsen ; Abramo Hefez and Neuza Kakuta ; Sheldon Katz ; Steven Kleiman and Ragni Piene ; Dan Laksov and Anders Thorup ; Raquel Mallavibarrena and Ragni Piene ; Arthur Mattuck ; J M Miret and S XamboDescamps ; Adam Parusinski and Piotr Pragacz ; C Procesi and S XamboDescamps ; Paul Roberts ; Francesc Rossello ; Israel Vainsencher ; Leendert J van Gastel ; Leendert J van Gastel