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A real number (実数, jissū) is a number that can be expressed on a number line.
It is mainly divided into rational numbers and irrational numbers, but can also be divided into positive numbers, negative numbers, and zeros.
It is also a complex number other than an imaginary number.
実数とは (ジッスウとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
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