From: Jim Pryor Date: Thu, 16 Sep 2010 01:09:58 +0000 (-0400) Subject: week1: tweaks X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=dd77681b844147e67a6ff31523c132db9c65b58d;hp=-c week1: tweaks Signed-off-by: Jim Pryor --- dd77681b844147e67a6ff31523c132db9c65b58d diff --git a/week1.mdwn b/week1.mdwn index cacb73fc..af079edf 100644 --- a/week1.mdwn +++ b/week1.mdwn @@ -59,6 +59,8 @@ 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 + 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: ((\a M) N)