manip trees: tweaks

[lambda.git] / offsite_reading.mdwn

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@@ -91,6 +91,10 @@ get more out of. (Rinse and repeat.)
 *      [The Y Combinator](http://dangermouse.brynmawr.edu/cs245/ycomb_jim.html) derives the applicative-order Y-combinator from scratch, in Scheme. This derivation is similar in flavor to the derivation found in The Little Schemer, but uses a slightly different starting approach...
 *   [The church of the least fixed point, by Sans Pareil](http://www.springerlink.com/content/n4t2v573m58g2755/)
 
+## Folds ##
+
+*    [[!wikipedia Fold (higher-order function)]]
+
 
 ## Types ##