Apparently, this user prefers to keep an air of mystery about them.
44 In categorical terms, why is there no canonical isomorphism from a finite dimensional vector space to its dual? Dec 30 '13
40 Original works of great mathematician Évariste Galois Jan 12 '12
32 Why is the cartesian product so categorically robust? May 29 '15
27 Tricky contour integral resulting from the integration of $\sin ax / (x^2+b^2)$ over the positive halfline Oct 1 '11
21 Elementary problems with group theoretic solutions Jan 15 '12