See Norvig's "Paradigms of Artificial Intelligence Programming - Case Studies in Common Lisp", Chapter 8 - Symbolic Mathematics : A Simplification Program, 8.6 - Integration, page 252.
http://norvig.com/paip.html
See Norvig's "Paradigms of Artificial Intelligence Programming - Case Studies in Common Lisp", Chapter 8 - Symbolic Mathematics : A Simplification Program, 8.6 - Integration, page 252.
http://norvig.com/paip.html