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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...

Points algébriques de degrés au plus 12 sur la quintique de Fermat

Thiéyacine Top, Oumar Sall (2015)

Acta Arithmetica

We determine explicitly the set of algebraic points of degree at most 12 over ℚ on the Fermat quintic. This extends a previous result given by M. Klassen and P. Tzermias (1997), who described the set of algebraic points of degree at most 6 over ℚ.

Points of order p of generic formal groups

Karl Zimmermann (1988)

Annales de l'institut Fourier

There are many similarities between elliptic curves and formal groups of finite height. The points of order p of a generic formal group are studied in order to develop the formal group analogue (applied to points of order p ) of the concept of level structure and that of the e n -pairing known in elliptic curve theory.

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