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Positive real numbers
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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, \mathbb_ = \left\, is the subset of those real numbers that are greater than zero.
In a complex plane, \mathbb_ 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 z = |z| \mathrm^ with argument \varphi = 0.
== Notation ==
Alternative to \mathbb_, the non-standard symbols \mathbb_ and \mathbb^ are often used. However, this may lead to confusion, as some authors use them to denote the set of non-negative real numbers, \mathbb_ = \left\, 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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