+ * [[Arithmetic with Church numbers|topics/week3_church_arithmetic]]
+ * [[How to get the `tail` of v1 lists?|topics/week3 lists#tails]]
+ * [[Some other list encodings|topics/week3 lists#other-lists]]
+ * [[Reduction Strategies and Normal Forms|topics/week3_evaluation_order]]
+ * [[Fixed point combinators|topics/week4_fixed_point_combinators]]
+ * [[More about fixed point combinators|topics/week4_more_about_fixed_point_combinators]]