Greg McShane

Bureau 328, Institut Fourier.

Teaching 2023-24

First semester

MAT 102


Second semester


What have I been doing lately?

Travelling in Japan visiting TiTech and Rims

Geometry of surfaces and its relations with number theory here are some preprints.

what I’m doing this week

more here

Simulation of an epidemic

I embedded this in a script with pygame too

What (else) do I do?

seminars I go to

Basically if you are looking for me on a Thursday well….forget it!

and a little more…

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

I was a member of ICERM at Brown University in 2019 participating in Illustrating Math and visits to

Here is the book that we wrote during the semester.

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

This is what I look like
IHP 2012 : La Maison des Maths
IHP 2012 : La Maison des Maths

More real math on blackboards



Rencontres du GDR in 2020:


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.

Recent preprints

Mostly geometry of surfaces and (elementary) number theory.


Talks were Reveal.js slides till 2023 but I’ve switched to Marp but it’s basically the same







From March 2014 I’ve also been working with the fablab MSTIC 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. collection of pieces

photo photo

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

photo photo

Finally (you can skip)

After being abused by ed as a teenager I’ve recently converted to the church of neovim

why ?