Séminaire à venir - Octobre 2026
Le séminaire aura lieu un mercredi par mois de 14h à 15h à l'Institut Henri Poincaré à Paris. Pour télécharger l'affiche du mois: octobre.pdf.
- 07/10/2026 - Richard Evan Schwartz (Brown University)
salle Maurice Frechet (ex-salle 05)
Titre: Origami
Tori
Resumé: An
origami torus is a piecewise
affine isometric embedding of a flat torus
into \(\mathbb{R}^3\). It is surprising that these things
exist, but they have been known to exist
since 1960. How many vertices do you
need to make an origami torus? In my
talk, I will explain my proof that you can do it with 8 but not with 7.
I will also explain why
almost every flat torus is isometric to an
origami torus -- this is joint work with Peter
Doyle. If time permits I will also explain why,
in fact, every flat torus is isometric to an
8-vertex origami torus. This is upcoming
work with Doyle, Fabian Lander, and Steve Trettel.