# 6.241 Fall 2009 Questions and Answers

- What is the 6.241 problem set policy?
- Normally, the problem sets are to be submitted
at the lecture on the due date. However, since
the purpose of the homework is to aid in learning
and progress assessment, not grading, I will be granting
extensions and make up options on a case-by-case
basis.
- For a valid reason, external to the 6.241 matters
(i.e. a (documented) conference deadline is possibly
acceptable while difficulty of the problem set is not)
I can grant a 1/2 week extension.
I will limit the total number of such extensions to
two per student, not counting those for medical or
family emergency reasons, prompted by a letter from
MIT administration.
- I will offer make-up problems to those who are not
satisfied with quality of their original papers and/or
the grades they have received. Such make-ups are to be
requested within a week after the graded original paper
was released, and will have their own submission
deadlines.

- Which linear
algebra textbooks will be useful?
- While I expect that any "proof-based" linear algebra text will
be adequate (though perhaps excessive), and I admit my ignorance
on what the best linear algebra textbooks are, here are my suggestions:
- "Linear Algebra Done Right" by Sheldon Axler: a popular undergraduate
textbook which is written from a "coordinate-free approach" viewpoint.
- "Linear Algebra" by Peter D. Lax: mostly because I have a copy, and
can see that it is adequate (though much more than you need)
- I have posted the lecture notes (pdf) from a graduate linear algebra
class being developed here specifically as the background for
EECS theory classes in systems, control, communications, and optimization.
Once again, it is a bit too much, but should be adequate as well.