On the closed image of a rational map and the implicitization problem

Details On the closed image of a rational map and the implicitization problem On the closed image of a rational map and the implicitization problem

2002-10-07

arxiv.org/abs/math/0210096v2

Mathematics

Algebraic Geometry

43 pages, revised version. To appear in Journal of Algebra

Scientific paper

In this paper, we investigate some topics around the closed image $S$ of a rational map $\lambda$ given by some homogeneous elements $f_1,...,f_n$ of the same degree in a graded algebra $A$. We first compute the degree of this closed image in case $\lambda$ is generically finite and $f_1,...,f_n$ define isolated base points in $\Proj(A)$. We then relate the definition ideal of $S$ to the symmetric and the Rees algebras of the ideal $I=(f_1,...,f_n) \subset A$, and prove some new acyclicity criteria for the associated approximation complexes. Finally, we use these results to obtain the implicit equation of $S$ in case $S$ is a hypersurface, $\Proj(A)=\PP^{n-2}_k$ with $k$ a field, and base points are either absent or local complete intersection isolated points.

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