Apparently, this user prefers to keep an air of mystery about them.
26 Prove that every year has at least one Friday the 13th aug 23 '11
12 After swapping the positions of the hour and the minute hand, when will a clock still give a valid time? aug 24 '11
10 Prove that all even integers $n \neq 2^k$ are expressible as a sum of consecutive positive integers aug 23 '11
2 fill the board with dominos aug 23 '11
2 Find the last member remained in game aug 23 '11
1 Hard simultaneous equation problem $5x^2y-4xy^2+3y^3-2(x+y)=0$, $xy(x^2+y^2)+2=(x+y)^2$ aug 26 '11