Initial commit.
Added some text to README
A few small edits/corrections/notes
Adding a new notebook for the nodal version (What I was trying to do in the first place).
Started deriving the nodal DO idea. Stopping before doing the heavy math. Also made a number of corrections
Pulling in some of the corrections from the nodal notebook into the modal one
Updating some of the math -- about the revisit the last steps again (I squared the interior when I didn't need to)
Committing an attempt at deriving an equation for finding appropriate nodes. It kinda went nowhere -- I wasn't sure where I wanted to go. This commit records this attempt -- I'm going to delete all of it and try something else.