From: Jim Pryor Date: Wed, 15 Sep 2010 21:08:19 +0000 (-0400) Subject: Merge branch 'pryor' X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=150fb8af99170bd3f4488401b31ed86af1c9d6a5;hp=19396ef0629ca6830163c3137d712780b517bbd4 Merge branch 'pryor' --- diff --git a/week1.mdwn b/week1.mdwn index 729b14d1..67d5828d 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 &8608; 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: