Hello,
I'm Heinrich Apfelmus or apfeλmus for short and these pages are mainly about the purely functional programming language Haskell.
This site was created with pandoc. Since pandoc 1.4 now supports templates with simple string substitution, I can now use it as a command-line program again and don't need to use it as a library anymore. Thanks pandoc!
I also used a Makefile but got sick of it really soon. Hence, I wrote my own make-like embedded language in just 80 lines of Haskell code. I love the result, but it was actually unnecessary, because there is already a well-designed library hmk for that.
The graphic at the top is the Dedekind tessellation of the upper half plane in hyperbolic triangles.