Mathematical Notes
On some mathematical topics I found interesting.
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Category:
Geometry
Not all finitely-presented groups are fundamental groups of closed 3-manifolds
Positive curvature versus negative curvature
SO(3) is a simple group: a geometric proof
Hairy ball theorem without degree theory
When does a finite metric space embed isometrically into an euclidean space?
Polygons inscribed in curves
Pick’s Theorem
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Alex Sisto
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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