For those of you in the 4:30 p.m. section, we ended class early on Thursday (September 17th, 2013), so I did not lecture on Chapter 7. Here is a video of that lecture from a previous semester. The first ten minutes are review, the Chapter 7 lecture begins at 9:52 in the video.
Warning: This is a large file (734 megabytes) so I only recommend attempting to view this video on campus (this is an on-campus server).