Apparently, this user prefers to keep an air of mystery about them.
73 How to define a bijection between $(0,1)$ and $(0,1]$? jun 20 '12
4 How many 4 worded sentences can a list of 5 words make if two of them must be in that sentence? aug 1 '12
3 Prove/Show that a number is square if and only if its prime decomposition contains only even exponents. jul 5 '12
-2 A question on logic: Is this statement true or false jun 20 '12