14

Answers
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6
Why is a topology made up of ‘open’ sets?
12
real symmetric matrix has real eigenvalues - elementary proof
2
Relating the angle between two vectors to max and min eigenvalues
0
Intuition for mean curvature.
6
Does every ellipse inside a tetrahedron inside a ball fit in a triangle inside the ball?
1
Optic fibers after Joseph O’Rourke
7
Why are so few operations with arity bigger than 2?
9
The “Dzhanibekov effect” - an exercise in mechanics or fiction? Explain mathematically a video from a space station
1
Towards a metric characterization of Euclidean spaces
2
Which norms have rich isometry groups?
1
Find symmetries of a tree
2
Why worry about the axiom of choice?
12
Examples of mathematics motivated by technological considerations
8
Is every finite group a group of “symmetries”?