From: Jim Pryor Date: Wed, 15 Sep 2010 21:11:28 +0000 (-0400) Subject: week1 tweaks X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=4e8aec5cb86b2838e8d556a9f8d6b2bcda215555 week1 tweaks Signed-off-by: Jim Pryor --- diff --git a/week1.mdwn b/week1.mdwn index ad6f98c4..e49724d9 100644 --- a/week1.mdwn +++ b/week1.mdwn @@ -185,7 +185,7 @@ Different authors use different notations. Some authors use the term "contractio M ~~> N -We'll mean that you can get from M to N by one or more reduction steps. Hankin uses the symbol → for one-step contraction, and the symbol ↠ for zero-or-more step reduction. Hindley and Seldin use ⊳1 and ⊳. +We'll mean that you can get from M to N by one or more reduction steps. Hankin uses the symbol → for one-step contraction, and the symbol ↠ for zero-or-more step reduction. Hindley and Seldin use ⊳1 and ⊳. When M and N are such that there's some P that M reduces to by zero or more steps, and that N also reduces to by zero or more steps, then we say that M and N are **beta-convertible**. We'll write that like this: