X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=week1.mdwn;h=db74d7c7f906e09ba2995a71cbadf35d475e5740;hp=af079edf543c975f90a646c8d4ea6a8625cd6454;hb=18ed46593f0f9f93ed365c7736f3a65a767f43b0;hpb=dd77681b844147e67a6ff31523c132db9c65b58d diff --git a/week1.mdwn b/week1.mdwn index af079edf..db74d7c7 100644 --- a/week1.mdwn +++ b/week1.mdwn @@ -59,7 +59,9 @@ We'll tend to write (λa M) as just `(\a M)`, so we don't hav Some authors reserve the term "term" for just variables and abstracts. We won't participate in that convention; we'll probably just say "term" and "expression" indiscriminately for expressions of any of these three forms. -Samples of expressions +Samples of expressions: + + foo The *lambda* calculus has an associated proof theory. For now, we can regard the proof theory as having just one rule, called the rule of **beta-reduction** or "beta-contraction". Suppose you have some expression of the form: