Mathematics – Algebraic Geometry
Scientific paper
1997-05-25
Mathematics
Algebraic Geometry
21 pages, DVI file available at http://www.math.kth.se/~sandra/Welcome Mittag-Leffler Report No 13, 1996/97 Latex
Scientific paper
We construct examples of smooth surfaces S in P^6 with no trisecant lines.
This list includes examples of surfaces not cut out by quadrics. We prove that
unless S has a finite number of disjoint $(-1)$-lines, and each one meets some
other line L on the surface with L^2\leq -2, and S is not an inner projection
from P^7 the surface belongs to the list of examples.
Ranestad Kristian
Rocco Sandra Di
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