By combining the language of groups with that of geometry and linear algebra, Marius Sophus Lie created one of math’s most powerful tools.

  Manifeste pour l’enseignement supérieur et l’éducation nationale [Vous pouvez signer ce manifeste (version pdf ici) dans ce formulaire. Un document de mise en perspective critique des discours de défense de l’IAg les plus courants...

Come see me on tour! https://standupmaths.com/shows/
Check out the paper: https://arxiv.org/pdf/2506.24088
Thanks so much to Mark Brittenham and Susan Hermille...

A community database of topological theorems and spaces, with powerful search and automated proof deduction.

We survey earlier results on factorizations of extremal projectors and relative extremal projectors and present preliminary results on non-commutative factorizations of relative extremal projectors: we deduce the existence of such factorizations for sl(4) and sl(5).

This survey focuses on the computational complexity of some of the
fundamental decision problems in 3-manifold theory. The article discusses the
wide variety of tools that are used to tackle these problems, including normal
and almost surfaces, hierarchies, homomorphisms to finite groups, and
hyperbolic structures.

Lectures notes + cool videos