Thursday, July 28, 2016

Tony Padilla & Matt Parker: Graham's Number


  • Maximum entropy that can be stored in your head
  • Smax = A / 4L ^ 2
  • L = 1.616 * 10 ^ -35m
  • A = 4 * pi * r ^ 2
  • 3↑3 = 3^3 = 3 * 3 * 3 = 27
  • 3↑↑3 = 3↑(3↑3) = 3↑ (3 * 3 * 3) = 3↑27 = 3^27 = 7,625,597,484,987
  • Knuth's up-arrow notation (クヌースの矢印表記)