comment on books

[lambda.git] / index.mdwn

diff --git a/index.mdwn b/index.mdwn
index 74aaddf..10aa503 100644 (file)
--- a/index.mdwn
+++ b/index.mdwn
@@ -122,7 +122,7 @@ and Caml, which are prominent *functional programming languages*. We'll explain
 what that means during the course.
 
 *      **Scheme** is one of two major dialects of *Lisp*, which is a large family
-of programming languages. The other dialect is called "Common Lisp." Scheme
+of programming languages. Scheme
 is the more clean and minimalistic dialect, and is what's mostly used in
 academic circles.
 Scheme itself has umpteen different "implementations", which share most of
@@ -135,8 +135,7 @@ another Scheme implementation, though, there's no compelling reason to switch.)
        Racket stands to Scheme in something like the relation Firefox stands to HTML.
 
 *      **Caml** is one of two major dialects of *ML*, which is another large
-family of programming languages. The other dialect is called "SML" and has
-several implementations. But Caml has only one active implementation,
+family of programming languages. Caml has only one active implementation,
 OCaml, developed by the INRIA academic group in France.
 
 *      Those of you with some programming background may have encountered a third
@@ -156,6 +155,8 @@ other.
 
 ## Recommended Books ##
 
+It's not necessary to purchase these for the class. But they are good ways to get a more thorough and solid understanding of some of the more basic conceptual tools we'll be using.
+
 *      *An Introduction to Lambda Calculi for Computer Scientists*, by Chris
 Hankin, currently $17 on
 [Amazon](http://www.amazon.com/Introduction-Lambda-Calculi-Computer-Scientists/dp/0954300653).