6.2, due on 2/28

1.  The concept of the kernel is very familiar but can it also be called the nullspace?  Theorem 6.13 was pretty heavy but I think the post-theorem paragraph made it clear.

2.  Theorem 6.12 was very logical and the proof was a little more complicated/long than I thought it would have to be.  The proof of 6.13 made sense but did not give much insight into the importance of the theorem.