This week we will have a look at the LISP family of languages. These 
are dynamic, untyped, memory-managed; they favor recursive programming 
that uses first-class functions---we'll go over all of these concepts in 
class.

     To get a head start, please read Ch.3 of the Mitchell textbook.

     I will follow up shortly with suggestions on Lisp interpreters you
could install, but if you use the Emacs editor, you already have one.
If you don't use Emacs, I suggest you spend some time with it, as
it is a useful, powerful, and programmable editor. Plus, you can
pick a side in the eternal "Emacs vs Vi" struggle!
http://jeffreygifford.com/wp-content/uploads/2011/01/emacs-vi-300x146.png

     I use emacs-24 that came with MacPorts, but there are many other
versions, including http://aquamacs.org/ .  Once you start Emacs,
an interactive tutorial can be called up with "Ctrl+h t" (most
Emacs commands consist of several keystrokes, one after another. If
you get confused in the middle of any such sequence, press Ctrl+G to 
clear).  A useful cheatsheet is http://www.rgrjr.com/emacs/emacs_cheat.html