X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=lambda_evaluator.mdwn;h=a3123fdccfb135d9dbc03e4d709fb775427ce379;hp=37908ab5c58608b7abbf70649ddb6670e268c219;hb=bd86f6e7780abe4dc7b03ac23c101d3f4b2f8c1f;hpb=6fb1c5023184b865e5adf586a31b19315020754c;ds=sidebyside diff --git a/lambda_evaluator.mdwn b/lambda_evaluator.mdwn index 37908ab5..a3123fdc 100644 --- a/lambda_evaluator.mdwn +++ b/lambda_evaluator.mdwn @@ -19,8 +19,9 @@ Blank lines are fine. *Abbreviations*: In an earlier version, you couldn't use abbreviations. `\x y. y x x` had to be written `(\x (\y ((y x) x)))`. We've upgraded the parser though, so now it should be able to understand any lambda term that you can. -*Constants*: The combinators `S`, `K`, `I`, `C`, `B`, `W`, and `T` are pre-defined to their standard values. Also, integers will automatically be converted to Church numerals. (`0` is `\s z. z`, `1` is `\s z. s z`, and so on.) +*Constants*: The combinators `S`, `K`, `I`, `C`, `B`, `W`, `T`, `M` (aka `ω`) and `L` are pre-defined to their standard values. Also, integers will automatically be converted to Church numerals. (`0` is `\s z. z`, `1` is `\s z. s z`, and so on.) +*Variables*: Variables must start with a letter and can continue with any sequence of letters, numbers, `_`, `-`, or `/`. They may optionally end with `?` or `!`. When the evaluator does alpha-conversion, it may change `x` into `x'` or `x''` and so on. But you should not attempt to use primed variable names yourself.