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 A simple proof of the GaussBonnet theorem for geodesic ball
 Least squares in a nonordinary sense
 Archimedes’ principle for hyperbolic plane
 Archimedes and the area of sphere
 Zeros of random polynomials
 Hopf fibration double covers circle bundle of sphere
 Euler’s formula e^ix = cos x + i sin x: a geometric approach
 An inequality for functions on the plane
 Weighted isoperimetric inequalities in warped product manifolds
 FaberKrahn inequality
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 Archimedes and the area of sphere
 Spherical cosine law
 Taylor expansion of metric
 Dual norm in R^n
 A condition for a Riemannian manifold to be a hyperbolic space
 Complex analysis  Problem solving strategies.
 Lie groups with biinvariant Riemannian metric
 A nontopological proof of the uniform boundedness principle
 A generalization of HsiungMinkowski formulas for hypersurfaces in the Euclidean space
 Surjectivity of Gauss map and its degree
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