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 Sobolev and Isoperimetric Inequality
 Hopf fibration double covers circle bundle of sphere
 A simple proof of the GaussBonnet theorem for geodesic ball
 A dynamical proof of Fermat's little theorem
 Why is a² + b² ≥ 2ab ?
 Spherical cosine law
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 Noncommutative probability II: independence
 Mean value properties for harmonic functions on Riemannian manifolds
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