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In calculus, a one-sided limit is either of the two limits of a function ''f''(''x'') of a real variable ''x'' as ''x'' approaches a specified point either from below or from above. One should write either: : or or or for the limit as ''x'' decreases in value approaching ''a'' (''x'' approaches ''a'' "from the right" or "from above"), and similarly : or or or for the limit as ''x'' increases in value approaching ''a'' (''x'' approaches ''a'' "from the left" or "from below") The two one-sided limits exist and are equal if the limit of ''f''(''x'') as ''x'' approaches ''a'' exists. In some cases in which the limit : does not exist, the two one-sided limits nonetheless exist. Consequently, the limit as ''x'' approaches ''a'' is sometimes called a "two-sided limit". In some cases one of the two one-sided limits exists and the other does not, and in some cases neither exists. The right-sided limit can be rigorously defined as: : Similarly, the left-sided limit can be rigorously defined as: : Where represents some interval that is within the domain of ==Examples== One example of a function with different one-sided limits is the following: : 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「One-sided limit」の詳細全文を読む スポンサード リンク
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