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dyadic rational : ウィキペディア英語版
dyadic rational

In mathematics, a dyadic fraction or dyadic rational is a rational number whose denominator is a power of two, i.e., a number of the form \frac where ''a'' is an integer and ''b'' is a natural number; for example, 1/2 or 3/8, but not 1/3. These are precisely the numbers whose binary expansion is finite.
==Use in measurement==
The inch is customarily subdivided in dyadic rather than decimal fractions; similarly, the customary divisions of the gallon into half-gallons, quarts, and pints are dyadic. The ancient Egyptians also used dyadic fractions in measurement, with denominators up to 1/64.〔.〕

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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