Apparently, this user prefers to keep an air of mystery about them.
15 An (apparently) vicious circle in logic sep 24 '12
13 How do the sets $\emptyset\times B,\ A\ \times \emptyset, \ \emptyset \times \emptyset $ look like? jul 14 '11
11 How to motivate the axioms for the inner product apr 30 '12
10 *Recursive* vs. *inductive* definition nov 4 '12