D. Perrin

collaborators

3 papers

math.AG1998

Triades et familles de courbes gauches

Robin Hartshorne, Mireille Martin-Deschamps, Daniel Perrin

Let $A$ be a noetherian ring and $R_{A}$ be the graded ring $A [X, Y, Z, T]$ . In this article we introduce the notion of a triad, which is a generalization to families of curves in ${\bf…

alg-geom1997

Construction de familles minimales de courbes gauches

Robin Hartshorne, Mireille Martin-Deschamps, Daniel Perrin

Let $A$ be a local noetherian ring and $N$ be a locally sheaf on the projective space $P_{A}^{3}$ : one proves easily that there exists a family $C$ of (smooth connected) curves contai…

alg-geom1997

Un théorème de Rao pour les familles de courbes gauches

Robin Hartshorne, Mireille Martin-Deschamps, Daniel Perrin

The aim of this paper is to prove a generalization of a theorem of Rao for families of space curves, which caracterizes the biliaison classes of curves. First we introduce the conc…