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Complex base systems : ウィキペディア英語版
Complex base systems

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〔W. Penney, A "binary" system for complex numbers, JACM 12 (1965) 247-248.〕).
==In general==
Let D be an integral domain \subset \C and |\cdot| the (Archimedean) absolute value on it.
A number X\in D in a positional number system is represented as an expansion
: X = \pm \sum_^ x_\nu \rho^\nu,
where
:
The cardinality R:=|Z| is called the ''level of decomposition''.
A positional number system or coding system is a pair
:\left\langle \rho, Z \right\rangle
with radix \rho and set of digits Z, and we write the standard set of digits with R digits as
:Z_R := \.
Desirable are coding systems with the features
* Every number in D, e. g. the integers \Z, the Gaussian integers \Z(i ) or the integers \Z(completed for the metric given by |\cdot| yielding K:=\R or K:=\C, is representable as an infinite series X which converges under |\cdot| for \nu \to -\infty, and the measure of the set of numbers with more than one representation is 0. The latter requires that the set Z be minimal, i. e. R=|\rho| for real resp. R=|\rho|^2 for complex numbers.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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