2 papers
math.AG1999
The Automorphism Group of Linear Sections of the Grassmannians G(1,N)
J. Piontkowski, A. Van de Ven
The Grassmannians of lines in projective N-space, G(1,N), are embedded by way of the Pl"ucker embedding in the projective space P(\bigwedge^2 C^{N+1}). Let H^l be a general l-codim…
math.AG1999
A local version of the Fulton-Hansen theorem relating secant and tangential varieties
J. M. Landsberg, J. Piontkowski
Withdrawn by the authors, the main theorem is incorrect