Publications , Preprints , Notes de cours , Liens ,

Pascal's triangle

A few open problems related to modular properties of determinants of symmetric matrices defined by binomial coefficients

Counting the number of triangulations of a finite number of points in convex position

A short description of the main result of my preprint "Counting Triangulations of Configurations"

Orchards

An applet written by my collegue Jean-Marc Decauwert which allows you to experiment with the Orchard relation (an equivalence relation on a finite set of points in R^2 which does not contain three aligned points).

(genericity), described in "Le cocycle du verger", CRAS 338 (2004), 187-190 and in "The Orchard relation of planar configurations of points I,II (coauthor D. Garber) to appear in Geombinatorics (I believe). You can create a point by a mouse-click (cr'eer), move a point (click on a point and drag it with clicked mouse) (d'eplacer) or remove a point (supprimer). Enabling the option "afficher" displays all lines determined by pairs of distinct points.
Roland Bacher, Institut Fourier (CNRS UMR 5582), 100 rue des Maths, Université de Grenoble I, 38402 Saint Martin d'Hères
Tel: ( 33 or 0 ) 4 76 51 43 10.
e-mail: bacher at fourier dot ujf-grenoble.fr