*OIT site licensing page on Mathematica. Technical details are explained there. Note: site address changed during summer 2011 following renaming of ITS (Information Technology Services) as OIT (Office of Information Technology)
Mathematica 4.2 Notebook for Chapter 4 exercises: PlaneTruss.nb. If you have problems downloading that file, click on this one: PlaneTruss.txt. Please read the top cell for instructions on how to quickly check the downloaded file. Some minor modifications of the code are still possible.
*HW Assignment #5 Solutions for Chapter 4.