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Positive real numbers : ウィキペディア英語版 | Positive real numbers In mathematics, the set of positive real numbers, , is the subset of those real numbers that are greater than zero. In a complex plane, is identified with the positive real axis and is usually drawn as a horizontal ray. This ray is used as reference in the polar form of a complex number. The real positive axis corresponds to complex numbers with argument . == Notation == Alternative to , the non-standard symbols and are often used. However, this may lead to confusion, as some authors use them to denote the set of non-negative real numbers, , which explicitly includes zero. The non-negative reals serve as the range for metrics, norms, and measures in mathematics.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Positive real numbers」の詳細全文を読む
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