Mathematics is hard for the same reason that self-analysis is notoriously hard.
Metagrobologist at TU/e
Stand back or squeeze your eyes to see me more clearly ;-)
Other website: www.puzzled.nl.
Ancient or should-be-almost-alive-by-now-because-of-the-fungi-website by me: http://web.inter.nl.net/users/C.Eggermont/