We are a group of mathematics students at The Chinese University of Hong Kong.
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Recent Posts
- Probability that a random inscribed triangle contains another circle
- Noncommutative probability II: independence
- Noncommutative probability I: motivations and examples
- A simple proof of the Gauss-Bonnet theorem for geodesic ball
- Least squares in a non-ordinary 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
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Top Posts
- Why is a² + b² ≥ 2ab ?
- Archimedes and the area of sphere
- Euler's formula e^ix = cos x + i sin x: a geometric approach
- Reilly type formula and its applications
- Closed Graph Theorem implies Open Mapping Theorem
- Mathematics behind JPEG
- Taylor expansion of metric
- Dual form of the spherical cosine law
- Hopf-Cole transformation and the Burgers' equation
- A simple result on homotopy in Riemannian manifolds
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想左一個好廢的 COROLLARY
Every countable set must has a proper countable subset that is bijective to it
but how many of such subset
how many means cardinality …