+++ /dev/null
-Lambda Evaluator
-----------------
-
-There is now a [lambda evaluator](http://lambda.jimpryor.net/lambda-let.html) available.
-It will allow you to write lambda terms and evaluate them, with full ability to inspect the results.
-(This won't work in Racket, because Racket doesn't even try to represent the internal structure of a function in a human-readable way.)
-
-*Lambda terms*: lambda terms are written with a backslash, thus: `((\x (\y x)) z)`.
-If you click "Reduce", the system will produce a lambda term that is guaranteed to be reduction equivalent (`<~~>`) with the original term. So `((\x (\y x)) z)` reduces to (a lambda term equivalent to) `(\y z)`.
-
-*Let*: in order to make building a more elaborate set of terms easier, it is possible to define values using `let`.
-In this toy system, `let`s should only be used at the beginning of a file. If we have, for intance,
-
- let true = (\x (\y x)) in
- let false = (\x (\y y)) in
- ((true yes) no)
-
-the result is `yes`. Things to watch out for: the expression after the equal sign must have balanced parentheses,
-and the "in" is obligatory. If you violate these rules, 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`.
-
-