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Javier

Cosmology PhD researcher with many side interests including computers (specially linux), badminton, traveling, photography, puzzles, games (board and video-), and anything interesting that makes me think.

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73 Is there a name for this type of polygon? Dec 6 '15
9 How can I prove that the hawaiian earring has no universal cover? Dec 6 '15
5 Is there any general method to calculate the universal cover of a given topological space $X$? Dec 6 '15
4 Covering of hawaiian earring Dec 5 '15
3 Euler characteristic of 2-sheeted covering space Dec 13 '15
3 Triangulation for a 1-manifold Nov 2 '15
3 “Exploding Dice” vs. “Non-Exploding Dice” Dec 3 '15
2 How many ways can n persons, including Alice and Bob, sit in a row with exactly k persons between Alice and Bob? Sep 12 '15
1 Prof of Reflexive, symmetric, or transitive relations Dec 1 '15
1 Prove that $S$ is colorable if and only if it is orientable Oct 22 '15
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