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+Lambda Evaluator
+----------------
+
+There is now a [lambda evaluator](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.  
+
+*Let*: in order to make building a more elaborate system 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
+
+*Comments*: