One of my favorite parts in The Art of Computer Programming is when Knuth goes into alternative numeric bases. He makes mention there of "base 2i" as well, thou

One of my favorite parts in The Art of Computer Programming is when Knuth goes into alternative numeric bases. He makes mention there of "base 2i" as well, though he details it in a much older paper: https://dl.acm.org/doi/10.1145/367177.367233 https://dl.acm.org/doi/10.1145/367177.367233 Base 2i is particularly fascinating for allowing a numeric system that can represent all complex numbers without signs and without addition.