I asked Beezer about the Sage (instead of Mathematica) version of his
linear algebra book, and he remarked:
"Thanks for the textbook advertisement. You can tell your students
that the partially Sage-enhanced textbook (about 80%) is available as
a big zip file of worksheets on
http://wiki.sagemath.org/devel/LatexToWorksheet
Some commands are un-merged patches, so they should be warned about that.
I should teach such a course once we get our "topics" course on a
regular rotation."
--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org