Mathematics – Algebraic Geometry
Scientific paper
2000-03-08
Mathematics
Algebraic Geometry
Latex2e, 18 pages
Scientific paper
In this paper we give the projective generation of congruences of order 1 of r-dimensional projective spaces in P^N from their focal loci. In a natural way, this construction shows that the corresponding surfaces in the grassmannian are the Veronese surface, and rational ruled surfaces eventually with singularities. We characterize when these surfaces are smooth, recovering and generalizing a Ziv Ran's result.
Pedreira-Perez Manuel
Sola-Conde Luis-Eduardo
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