• Mathematical Style at this Site - a README file.

• Reversed Ages.
  Pairs of ages such as 78, 87, with a simple study of their occurrence.
  
  
• Dr Stone's Mathematical Aphorisms.
  
  
• Convert from Centigrade to Fahrenheit in your head.
  An exact method.
  
  
• Two Definitions of Partially Ordered Sets.
  Showing how they are equivalent.

• Algebras of Digraphs and Posets.
  Giving an algebraic way of representing them (10K).
  
  
• Partially Ordered Historical Events.
  An account for mathematicians (9K).
  
  
• Spherical Astronomy by Analytical Geometry. - Using stereographic projection.
  (12K + 10K GIF).

Last updated: 18 March 2009