Add new comment


my dad (actuary) and I (journeyman maths student) looked at this in 1950s.... we thought the rule was:
even disks left
odd disks right
additional "modulus arithmetic" tuition about going around to the other side
seemed cool and simple..... graph theory is also cool but harder for pre-highschool "student" (soi-dis)

Bob "A"

Filtered HTML

  • Web page addresses and email addresses turn into links automatically.
  • Allowed HTML tags: <a href hreflang> <em> <strong> <cite> <code> <ul type> <ol start type> <li> <dl> <dt> <dd>
  • Lines and paragraphs break automatically.
  • Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.