X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=week1.mdwn;h=67d5828df04449f17912577399937b77bf9dbe63;hb=150fb8af99170bd3f4488401b31ed86af1c9d6a5;hp=729b14d1760782f20b98106c2a0a227e6a1bab2b;hpb=f259b9c18ecee2715349fefba2de8209a896cd69;p=lambda.git
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: