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Extended real number line : ウィキペディア英語版
Extended real number line

In mathematics, the affinely extended real number system is obtained from the real number system by adding two elements: and (read as positive infinity and negative infinity respectively). These new elements are not real numbers. It is useful in describing various limiting behaviors in calculus and mathematical analysis, especially in the theory of measure and integration. The affinely extended real number system is denoted \overline{\mathbb{R}} or or .
When the meaning is clear from context, the symbol is often written simply as .
==Motivation==


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「Extended real number line」の詳細全文を読む



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