This is amazing! I have always been baffled by the ever more convoluted parking signs. This is especially useful since very often you have to figure out if you can park while driving by, so you don't have much time to analyse the signs.
6 karma · joined November 25, 2009
Love the trick with how this can be done via differentiating the equation:
1 + r + r^2 + ... = 1/(1-r)