add note about Hindley and Seldin

Signed-off-by: Jim Pryor <profjim@jimpryor.net>

diff --git a/index.mdwn b/index.mdwn
index ad2def6..33b77c8 100644 (file)
--- a/index.mdwn
+++ b/index.mdwn
@@ -142,6 +142,10 @@ other.
 Hankin, currently $17 on
 [Amazon](http://www.amazon.com/Introduction-Lambda-Calculi-Computer-Scientists/dp/0954300653).
 
 Hankin, currently $17 on
 [Amazon](http://www.amazon.com/Introduction-Lambda-Calculi-Computer-Scientists/dp/0954300653).
 

+*      (Another good book covering the same ground as the Hankin book, but
+more thoroughly, and in a more mathematical style, is *Lambda-Calculus and Combinators:
+an Introduction*, by J. Roger Hindley and Jonathan P. Seldin.)
+

 *   *The Little Schemer, Fourth Edition*, by Daniel P. Friedman and Matthias
 Felleisen, currently $23 on [Amazon](http://www.amazon.com/exec/obidos/ASIN/0262560992).
 This is a classic text introducing the gentle art of programming, using the
 *   *The Little Schemer, Fourth Edition*, by Daniel P. Friedman and Matthias
 Felleisen, currently $23 on [Amazon](http://www.amazon.com/exec/obidos/ASIN/0262560992).
 This is a classic text introducing the gentle art of programming, using the