Linear orbits of arbitrary plane curves

Details Linear orbits of arbitrary plane curves Linear orbits of arbitrary plane curves

1999-12-11

arxiv.org/abs/math/9912092v1

Michigan Math. J. 48 (2000), 1-37

Mathematics

Algebraic Geometry

33 pages, AmS-TeX 2.1

Scientific paper

10.1307/mmj/1030132706

The `linear orbit' of a plane curve of degree $d$ is its orbit in $\P^{d(d+3)/2}$ under the natural action of $\PGL(3)$. In this paper we obtain an algorithm computing the degree of the closure of the linear orbit of an arbitrary plane curve, and give explicit formulas for plane curves with irreducible singularities. The main tool is an intersection@-theoretic study of the projective normal cone of a scheme determined by the curve in the projective space $\P^8$ of $3\times 3$ matrices; this expresses the degree of the orbit closure in terms of the degrees of suitable loci related to the limits of the curve. These limits, and the degrees of the corresponding loci, have been established in previous work.

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