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Towards a metric characterization of Euclidean spaces
asked May 8 '11 at 8:42
Matrix representation of real *-algebras
asked Jun 3 '11 at 21:40
Examples of mathematics motivated by technological considerations
real symmetric matrix has real eigenvalues - elementary proof
Is every finite group a group of “symmetries”?
The “Dzhanibekov effect” - an exercise in mechanics or fiction? Explain mathematically a video from a space station
Why is a topology made up of 'open' sets?
Can the unsolvability of quintics be seen in the geometry of the icosahedron?
Why are so few operations with arity bigger than 2?
Does every ellipse inside a tetrahedron inside a ball fit in a triangle inside the ball?
Why are L4 and L5 lagrangian points stable?