February 20, 2013 Pentagons A while back I developed a mild obsession with pentagons (mathematical ones, not symbolistic!) It started when I discovered some beautiful (simple and to me,…

September 30, 2010 Update to Functional Equations Reference (version 1.3) This is a substantial update of this reference document. The most important addition is the chain and substitution rules for arithmetic difference calculus (ADC)….