Section 16.5 Reference Topics
Here is an interesting review of linear programming.
http://people.hofstra.edu/faculty/Stefan_Waner/RealWorld/Summary4.html
This is an interesting site (copyright 1998-2000 by Robert G. Scharein) that discusses knot theory. It is fun, informative,
and has many, many links to knot theory.
http://www.cs.ubc.ca/nest/imager/contributions/scharein/knot-theory/knot-theory.html