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Towards a metric characterization of Euclidean spaces
asked May 8 '11 at 8:42
Examples of mathematics motivated by technological considerations
real symmetric matrix has real eigenvalues - elementary proof
The “Dzhanibekov effect” - an exercise in mechanics or fiction? Explain mathematically a video from a space station
Is every finite group a group of “symmetries”?
Why are so few operations with arity bigger than 2?
Why is a topology made up of 'open' sets?
Does every ellipse inside a tetrahedron inside a ball fit in a triangle inside the ball?