On some mathematical topics I found interesting.
Van Kampen diagrams: an application to tiling problems
Not all finitely-presented groups are fundamental groups of closed 3-manifolds
An elementary application of ping-pong lemma
Some SQ-universal groups
A theorem of Schur on commutator subgroup
Positive curvature versus negative curvature
Cancellation property for groups I
« 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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