natural-number-game

diff --git a/advanced-addition.lean b/advanced-addition.lean
@@ -4,7 +4,8 @@ begin
   exact hs,
 end
 
-theorem succ_succ_inj {a b : mynat} (h : succ(succ(a)) = succ(succ(b))) :  a = b := 
+theorem succ_succ_inj {a b : mynat} 
+                      (h : succ(succ(a)) = succ(succ(b))) : a = b := 
 begin
   apply succ_inj,
   apply succ_inj,

diff --git a/function.lean b/function.lean
@@ -3,7 +3,7 @@ begin
   exact h(p),
 end
 
-example : mynat → mynat :=
+example : ℕ → ℕ :=
 begin
   intro n,
   exact 3 * n + 2,

diff --git a/preposition.lean b/preposition.lean
@@ -66,12 +66,3 @@ begin
   cc,
 end
 
-
-
-
-
-
-
-
-
-