André M. Carrington

Ph.D M.Math P.Eng


Philosophy, sociology and psychology:

Humour: Tom Papa's stand-up comedy

Mathematical Puzzles: here is a problem an 8-year old child can understand but nobody has solved: the 3n+1 problem or Collatz conjecture.

  • Spoiler alert: most web pages about it contain analysis and attempts toward a solution.
  • Warning: this unsolved problem is famous for wasting time, as in this comic.
  • It is described here and more formally here.
  • Academic papers continue to be published about it--e.g. by Tao, Ren, etc.