Here are a few brief comments the grader had about various homework problems:

• HW 6 On #2 some people didn't realize 0 could be an eigenvalue and just included one example eigenvector instead of the whole space. On #4a some people forgot to check both independent and dependent cases, and on #4b most just assumed the eigenvalue was the same for all eigenvectors. That's pretty much it!
• HW 5 Other than the confusion on 2 b), some people just assumed that linearity proved #1 a) and b). On part a) some people wrote [v]_B as a matrix rather than a vector.
• HW 4 Most people missed one or two of the true-false questions, and #2 & #3 were easy, so everybody got those. On #4 most people didn't really understand how to use surjectivity ( i.e. just assuming that there are two elements w and v such that f(w) = v instead of that there is a w for each v). And finally on #5 some people still forgot to prove both directions.