-* Reduction Strategies and Normal Forms
-* [[Unit and its usefulness|topics/week3 unit]] (posted on Wednesday)
-* [[Combinatory Logic|topics/week3 combinatory logic]] (revised on Monday and Tuesday)
-* [[Homework for week 3|exercises/assignment3]]
+* Reduction Strategies and Normal Forms (will try to post soon)
+* [[Unit and its usefulness|topics/week3 unit]]
+* [[Combinatory Logic|topics/week3 combinatory logic]]
+* [[Homework for week 3|exercises/assignment3]] ([[Answers|exercises/assignment3_answers]])
+
+Week 4:
+
+* [[Fixed point combinators|topics/week4_fixed_point_combinators]]
+* [[More about fixed point combinators|topics/week4_more_about_fixed_point_combinators]]
+* Towards types (in progress)
+* [[Homework for week 4|exercises/assignment4]]