Lecture 7

This lecture was a good bit easier - probably because last time I finally got all that surface tension stuff :) As seems to be the norm, the trickiest part is the setup of the linearized equations - there's a lot of information in a pretty small space, so I'll need to reread that again to get it fully, but that seems to be the way things generally work in this class, so I'm not too worried, it's getting easier to do that.