X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=week1.mdwn;h=e49724d988b25111363940f35236ce3904053dee;hp=ad6f98c43275194d2475d8810ecf0a1ddd9364d1;hb=4e8aec5cb86b2838e8d556a9f8d6b2bcda215555;hpb=a96554f290c5878a567cfd4e3399d0729ab25030 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: