Complex-base system
In arithmetic, a complex-base system is a positional numeral system whose radix is an imaginary (proposed by Donald Knuth in 1955) or complex number (proposed by S. Khmelnik in 1964 and Walter F. Penney in 1965). == In general == Let D {\displaystyle D} be an integral domain ⊂ C {\displaystyle \subset \mathbb {C} } , and | ⋅ | {\displaystyle |\cdot |} the (Archimedean) absolute value on it.