Mathematics – Algebraic Geometry
Scientific paper
1999-05-24
Mathematics
Algebraic Geometry
PlainTex; to appear
Scientific paper
It is proved that a smooth rational surface in projective four-space, which
is ruled by cubics or quartics has degree at most 12. It is also proved that a
smooth rational surface in projective four-space which is the image of Fn by a
linear system with "simple base points" (see text) has degree at most 12.
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