Naren 5 and 6

O.K., y'all. I was not there for lecture 6, so these will not be posted until someone returns the favor and ships me some notes, or I borrow a recording, or I reconstruct the notes from text, or some combination of the above happens. I was in an auto accident Monday and had to go take care of unpleasant business. I'm not hurt, so it could have been worse.