On some mathematical topics I found interesting.
Some SQ-universal groups
On subgroups of surface groups
Fiber product of graphs and Howson’s theorem for free groups
Surfaces and commutators in free groups
How Stallings proved finitely generated groups are subgroup separable
Free groups acting on the circle
Weak Tarski’s problem: Groups having the same universal theory as a free group
« Older posts
Exploring the works of Gilbert Baumslag
Gödel Lost Lettre and P=NP
Geometric Group Theory
Geometry and the Imagination
Here there be dragons
Image des Mathématiques
Low Dimensional Topology
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