1. 2021-04-10 [5] [Haskell-beginners] Strange use of undefined (et al.) haskell-b Matthew Low 2. 2021-04-08 [4] [Haskell-beginners] Is map (map f) just map f? haskell-b Ut Primum 3. 2021-04-04 [2] [Haskell-beginners] Type class instance with Num haskell-b Bob Ippolito