X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=topics%2Fweek3_what_is_computation.mdwn;h=b5c9d5ba265aa1113fda8c398d5dc5a270822272;hp=0c9c5c5431a09124fabcf1b9ec1869a283dd5e59;hb=78cfc3595320d328af3892701b8ba7973a1538e3;hpb=63156a22b401c0fdbe7a6b98ac0e402977ec8a5b

diff --git a/topics/week3_what_is_computation.mdwn b/topics/week3_what_is_computation.mdwn
index 0c9c5c54..b5c9d5ba 100644
--- a/topics/week3_what_is_computation.mdwn
+++ b/topics/week3_what_is_computation.mdwn
@@ -135,11 +135,13 @@ pathological examples where the results do not align so well:
     (\x. x x) (\x. x x) ~~> (\x. x x) (\x. x x) ~~> (\x. x x) (\x. x x) ~~> ...
 
 In this example, reduction returns the exact same lambda term.  There
-is no simplification at all.
+is no simplification at all. (As we mentioned in class, the term `(\x. x x)` is often referred to in these discussions as (little) <b>&omega;</b>, or sometimes **M**; and its self-application <code>&omega; &omega;</code>, displayed above, is called (big) <b>&Omega;</b>.)
+
+Even worse, consider this term:
 
     (\x. x x x) (\x. x x x) ~~> (\x. x x x) (\x. x x x) (\x. x x x) ~~> ...
 
-Even worse, in this case, the "reduced" form is longer and more
+Here, the "reduced" form is longer and more
 complex by any reasonable measure.
 
 We may have to settle for the idea that a well-chosen reduction system