On some mathematical topics I found interesting.
Graphs and Free 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
Euler-Poincaré characteristic (I): Euler’s formula and graph theory
Rado graph and 0-1 law for finite graphs
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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