Apparently, this user prefers to keep an air of mystery about them.
9 Motivation for solution to constructing a set of 1983 distinct integers such that no three are consecutive terms of an arithmetic progression jan 10 '12
7 Confusion concerning Burnside's Lemma apr 22 '12
7 Explanation for why $1\neq 0$ is explicitly mentioned in Chapter 1 of Spivak's Calculus for properties of numbers. jun 30 '12
7 Meaning and example(s) of Qiaochu's quote. oct 17 '12
6 Linear Algebra and Geometry by Kostrikin and Manin: Remark regarding diagrams and graphic representations. nov 29 '12
4 If the product of two non-zero square matrices is zero, then both factors must be singular. feb 21 '12