Sage notebook on relations

I filled in for Al Doerr in his class this morning and he asked me to cover some material on relations. So I took that opportunity to figure out how to implement some relations in Sage. It went pretty well. One exception is that in squaring an adjacency matrix of a relation, I'd like to get a simple adjacency matrix with just 0's and 1's. The way I did the calculations, I got the numbers of different paths of length 2 connecting the vertices. That's fine except that the graphs of the squared relations become messy. If anyone knows how to fix this, I'd appreciate the help.

http://www.sagenb.org/home/pub/4715

Two Part Version of Applied Discrete Structures

Applied Discrete Structures is now available in either a single volume or in a two part version:
Part 1 - Fundamentals
Part 2 - Algebraic Structures
It broken according to how the two semesters of discrete math are taught at UMass Lowell. We did this for a few reasons. One is that many of our students only need to take the first semester. Also, the full version, whether as a pdf or a printed book, is quite large (484 pages).

Information on the one and two part versions (as free pdf's or printed copies from lulu.com) is available on our web site:
http://faculty.uml.edu/klevasseur/ads2

Change in Creative Commons License

It's come to my attention that the Creative Commons License that we had posted:

Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License

did not allow instructors to bundle selected chapters for distribution to students due to the "no derivatives" restriction. This wasn't our intent, in fact this is precisely what we do for instructors at UMass Lowell. To remedy the situation, the following license has been posted on our web site.


Applied Discrete Structures by Alan Doerr & Kenneth Levasseur is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License

Most of the existing files still list the No Derivatives restriction a this time, but they will be updated as we proceed.

Full Text now available on lulu.com

Version 1.0 of the text, all 16 chapters with solutions to odd-numbered exercises is now available on lulu.com.

Solutions to Chapter 14 (odd numbers) added

We've reached a milestone today, with the final bit of solutions to the odd numbered exercises in the main body of the book being added to the wiki site. The solutions to problems in Chapter 14 were just added. The only things left to add are the appendices, which were on determinants and algorithms, and the references. Both need to be updated considerably, so that might take a while.