Plane Algebraic Curves

Plane Algebraic Curves

We go over some of the basics of plane algebraic curves, which are planar curves described as the set of solutions of a polynomial in two variables. We study many basic notions, such as projective space, parametrization, and the intersection of two curves. We end with the group law on the cubic and search for torsion points.

Real Plane Algebraic Curves

We study real algebraic plane curves, at an elementary level, using as little algebra as possible. Both cases, affine and projective, are addressed. A real curve is infinite, finite or empty according to the fact that a minimal polynomial for the curve is indefinite, semi–definite nondefinite or definite. We present a discussion about isolated points. By means of the operator, these points can ...

Topology of Plane Algebraic Curves

Analysis of Real Algebraic Plane Curves

This work describes a new method to compute geometric properties of a real algebraic plane curve of arbitrary degree. These properties contain the topology of the curve as well as the location of singular points and vertical asymptotes. The algorithm is based on the Bitstream Descartes method (Eigenwillig et al.: “A Descartes Algorithm for Polynomials with Bit-Stream Coefficients”, LNCS 3718), ...

3-designs Derived from Plane Algebraic Curves

In this paper, we develop a simple method for computing the stabilizer subgroup of a subgroup of D(g) = {α ∈ Fq | there is a β ∈ Fq such that β = g(α)} in PSL2(Fq), where q is a large odd prime power, n is a positive integer dividing q − 1, and g(x) ∈ Fq [x]. As an application, we construct new infinite families of 3-designs (cf. Examples 3.4 and 3.5).