Apparently, this user prefers to keep an air of mystery about them.
2 How to show that wedge sum is coproduct? Oct 12 '12
1 How to prove that the slice category over a Quillen model category is also a Quillen model category? Oct 16 '12
1 Morphism is a retraction of another morphism? Oct 17 '12
1 How to prove that coequalizer is a epimorphism? Oct 17 '12
0 How to show that $\Delta[n]$ isn't Kan fibrant…? Oct 17 '12
0 How does the reduced cone look like? Oct 20 '12