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Power function : ウィキペディア英語版
Power function

In mathematics, a power function is a function of the form :f\colon x \mapsto c x^r \; c,r \in \mathbb where c and r are constant real numbers and x is a variable. The domain of a power function can sometimes be all real numbers, but generally a non-negativity x \ge 0 is used to avoid problems with simplifying. The domain of definition is determined by each individual case.
Power functions are a special case of power law relationships, which appear throughout mathematics and statistics.
==See also==

* Exponentiation

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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