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One-sided limit : ウィキペディア英語版
One-sided limit

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:
:\lim_f(x)\ or \lim_\,f(x) or \lim_\,f(x) or \lim_ a}f(x)
for the limit as ''x'' decreases in value approaching ''a'' (''x'' approaches ''a'' "from the right" or "from above"), and similarly
:\lim_f(x)\ or \lim_\, f(x) or \lim_\,f(x) or \lim_ a}f(x)
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
:\lim_ f(x)\,
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:
:\forall\varepsilon > 0\;\exists \delta >0 \;\forall x \in I \;(0 < x - a < \delta \Rightarrow |f(x) - L|<\varepsilon)
Similarly, the left-sided limit can be rigorously defined as:
:\forall\varepsilon > 0\;\exists \delta >0 \;\forall x \in I \;(0 < a - x < \delta \Rightarrow |f(x) - L|<\varepsilon)
Where I represents some interval that is within the domain of f
==Examples==

One example of a function with different one-sided limits is the following:
:\lim_{1 \over 1 + 2^{-1/x}} = 0.

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



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