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Perturbing plane cruve singularities.

Eduardo Casas-Alvero, Rosa Peraire (2003)

Revista Matemática Iberoamericana

We describe the singularity of all but finitely-many germs in a pencil generated by two germs of plane curve sharing no tangent.

Pinceaux de courbes planes et invariants polaires

Evelia R. García Barroso, Arkadiusz Płoski (2004)

Annales Polonici Mathematici

We study pencils of plane curves f t = f - t l N , t ∈ ℂ, using the notion of polar invariant of the plane curve f = 0 with respect to a smooth curve l = 0. More precisely we compute the jacobian Newton polygon of the generic fiber f t , t ∈ ℂ. The main result gives the description of pencils which have an irreducible fiber. Furthermore we prove some applications of the local properties of pencils to singularities at infinity of polynomials in two complex variables.

Plane curves with small linear orbits, I

Paoli Aluffi, Carel Faber (2000)

Annales de l'institut Fourier

The “linear orbit” of a plane curve of degree d is its orbit in d ( d + 3 ) / 2 under the natural action of PGL ( 3 ) . In this paper we compute the degree of the closure of the linear orbits of most curves with positive dimensional stabilizers. Our tool is a nonsingular variety dominating the orbit closure, which we construct by a blow-up sequence mirroring the sequence yielding an embedded resolution of the curve. The results given here will serve as an ingredient in the computation of the analogous information for...

Plane projections of a smooth space curve

Trygve Johnsen (1996)

Banach Center Publications

Let C be a smooth non-degenerate integral curve of degree d and genus g in 3 over an algebraically closed field of characteristic zero. For each point P in 3 let V P be the linear system on C induced by the hyperplanes through P. By V P one maps C onto a plane curve C P , such a map can be seen as a projection of C from P. If P is not the vertex of a cone of bisecant lines, then C P will have only finitely many singular points; or to put it slightly different: The secant scheme S P = ( V P ) 2 1 parametrizing divisors in...

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