(no commit message)

diff --git a/topics/_week5_system_F.mdwn b/topics/_week5_system_F.mdwn
index e69eeb4..55f49ae 100644 (file)
--- a/topics/_week5_system_F.mdwn
+++ b/topics/_week5_system_F.mdwn
@@ -116,15 +116,15 @@ however.  Here is one way, coded in
 System F|http://www.cis.upenn.edu/~bcpierce/tapl/index.html]] (the
 relevant evaluator is called "fullpoly"):
 
 System F|http://www.cis.upenn.edu/~bcpierce/tapl/index.html]] (the
 relevant evaluator is called "fullpoly"):
 

-    N = ∀α. (α->α)->α->α;
-    Pair = (N->N->N) -> N;
-    let zero = Λα. λs:α->α . λz:α. z in 
-    let fst = λx:N. λy:N . x in
-    let snd = λx:N. λy:N . y in
-    let pair = λx:N. λy:N . λz:N->N->N . z x y in
-    let suc = λn:N. λα . λlambda s:α->α . λz:α. s (n [α] s z) in
-    let shift = λp:Pair. pair (suc (p fst)) (p fst) in
-    let pre = λn:N. n [Pair] shift (pair zero zero) snd in
+    N = ∀α.(α->α)->α->α;
+    Pair = (N->N->N)->N;
+    let zero = Λα.λs:α->α.λz:α. z in 
+    let fst = λx:N.λy:N.x in
+    let snd = λx:N.λy:N.y in
+    let pair = λx:N.λy:N.λz:N->N->N.z x y in
+    let suc = λn:N.λα.λs:α->α.λz:α.s (n [α] s z) in
+    let shift = λp:Pair.pair (suc (p fst)) (p fst) in
+    let pre = λn:N.n [Pair] shift (pair zero zero) snd in

 
     pre (suc (suc (suc zero)));
 
 
     pre (suc (suc (suc zero)));