X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=lambda_evaluator.mdwn;h=7228fca7a6081714c2d874b53db032ff00f6be06;hp=16eace75deb7f136ab8866ca72764d778eb5d1fa;hb=8dd323ab2d93d590e51cfe30de3cb89d2840f175;hpb=95e1d6e5ad4b98f8f8b359fb0033c913086f98d3;ds=sidebyside

diff --git a/lambda_evaluator.mdwn b/lambda_evaluator.mdwn
index 16eace75..7228fca7 100644
--- a/lambda_evaluator.mdwn
+++ b/lambda_evaluator.mdwn
@@ -13,10 +13,25 @@ In this toy system, `let`s should only be used at the beginning of a file.  If w
 
     let true = (\x (\y x)) in
     let false = (\x (\y y)) in
-    ((true true) false)
+    ((true yes) no)
 
-the result is `true`.
+the result is `yes`.  Things to watch out for: the expression after the equal sign must have balanced parentheses,
+and the "in" is obligatory.  The system will still produce a result, but it won't make much sense.
+
+*Abbreviations*, **NOT**: No abbreviations work.  So `\xy.yxx` must be written `(\x (\y ((y x) x)))`.  (As in Scheme or Racket.)
+
+*Comments*: anything following a semicolon to the end of the line is ignored.
+Blank lines are fine.
+
+Under the hood
+---------------
+
+The interpreter is written in JavaScript (which is not closely related to Java), and runs inside your browser.
+So if you decide to reduce a term that does not terminate (such as `((\x (x x)) (\x (x x)))`), it will be your 
+browser that stops responding, not the wiki server.
+
+You can inspect the code [here](http://lambda.jimpryor.net/code/lambda.js).  Suggestions for improvements welcome.
+
+Improvements we hope to add soon: the ability to reduce Combinatory Logic combinators; the ability to translate from CL to the lambda calculus; and more sensible variable names instead of `g354`.
 
-*Comments*:
 
-[more soon]