X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=week1.mdwn;h=ad6f98c43275194d2475d8810ecf0a1ddd9364d1;hp=67d5828df04449f17912577399937b77bf9dbe63;hb=a96554f290c5878a567cfd4e3399d0729ab25030;hpb=9357992afd5f243d6154d0d21d4fc2637ce1a925 diff --git a/week1.mdwn b/week1.mdwn index 67d5828d..ad6f98c4 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 &8608; 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: