I've heard that LaTeX is Turing complete. Are there any programs written in LaTeX?

Question

It\'s possible to do interesting things with what would ordinarily be thought of as typesetting languages. For example, you can construct the Mandelbrot set using postscript.

Answer 1

\def\K#1#2{#2}

\def\S#1#2#3{#1#3{#2#3}}