- Directeur de GDR TRESSES
- research statement
- my github account

I am a (low dimensional) topologist a subject which has it's origins in the work of the French mathematician Henri Poincaré. Recently I have been doing a lot of topology and WebGL and 3D printing of fractals.

I’m back from a sabbatical in the US at Brown University Illustrating Math and visits to

- Boston College
- CUNY Graduate Center

And where I got time to do write stuff for Inkscape like this Apollonian Packings

This is what I look like

IHP 2012 : La Maison des Maths

- Teaching
- Research
- FabLab
- FdS
- Other stuff

Didn’t teach as I was on sabbatical at Brown University. Illustrating Math.

Last year I taught **L3B algebra**.

- Groups
- Rings
- Actions of groups
- The symmetric groups
- Linear algebra

For the last few years years I was teaching M1 Algebra

*IMPORTANT : classes are suspended because of the pandemic.*

I’ll probably finish the graduate course online using Zoom

Notes and reading material:
Course Page

- Mondays 10:00 I’m teaching a graduate course on Geometry of Surfaces.
- Thursday and Friday at 8:00 MAT402 local repo
- Wednesdays I will be teaching Topography of Numbers at ENS-Lyon provided the SNCF gets me there. Course Page

- I am
**director**of the GDR des Tresses - I am an associate member of GEAR

If you want to advertise conferences/jobs please mail me

Meetings in low dimensional topology and dynamics

- WINTERBRAIDS
- Artin Groups, CAT(0) Geometry and Related Topics
- Teichmüller Theory: Classical, Higher, Super and Quantum
- Complex Hyperbolic Geometry and Related Topics
- Conférence internationale à la mémoire de Patrick Dehornoy

- WinterBraids VIII
- TQFT et Catégorification
- Complex Reflection Groups and their Braid Groups
- Summer school Teichmüller dynamics, mapping class groups

- Journées Géométrie et Topologie ENS Lyon
- Journees de doctorants du GdR TRESSES, 16-17/11/17
- WinterBraids VII
- Teichmüller Space, Polygonal Billiard, Interval Exchanges CIRM
- Minkowski ? function, Grenoble
- Interactions Topologie/Codes quantiques, Marseille

- Teichmueller space
- Modular group actions
- Applications to low dimensional topology

This is a quasi-Fuchsian manifold - it’s a basic kind of 3 manifold homeomorphic to the product of a surface and an interval together with a (non unique) choice of hyperbolic metric. Togther with Prof. S. Kojima of TITEC we are working on applying converegence results for quasi-Fuchsian manifolds and Teichmueller theory to get information about closed hyperbolic manifolds.

With Bill Goldman and a couple of his ex students we have been working on a book that just got published by the AMS. Much of it is dedicated to explaining this picture of an invariant fractal in the character variety.

- On systoles and ortho spectrum rigidity
- NORMALIZED ENTROPY VERSUS VOLUME FOR PSEUDO-ANOSOVS
- EQUIDECOMPOSABILITY, VOLUME FORMULAE AND ORTHOSPECTRA
- GEOMETRIC IDENTITIES

From March 2014 I’ve also been working with the MSTIC FabLab making mathematical curiosities from wood. I’m mainly interested in constructing geometric objects in wood using kerf bending patterns. Wood prepared using a laser cutting machine can be bent and joined to like a 3 dimensional jigsaw puzzle.

In November 2014 I was invited to take part in a workshop for architectural students Architect 2.0 Grenoble to explain the techniques and possibilities.