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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Microcontinuity ： ウィキペディア英語版 Microcontinuity In non-standard analysis, a discipline within classical mathematics, microcontinuity (or ''S''-continuity) of an internal function ''f'' at a point ''a'' is defined as follows: :for all ''x'' infinitely close to ''a'', the value ''f''(''x'') is infinitely close to ''f''(''a''). Here ''x'' runs through the domain of ''f''. In formulas, this can be expressed as follows: :if $x\backslash approx\; a$ then $f(x)\backslash approx\; f(a)$. For a function ''f'' defined on $\backslash mathbb$, the definition can be expressed in terms of the halo as follows: ''f'' is microcontinuous at $c\backslash in\backslash mathbb$ if and only if $f(hal(c))\backslash subset\; hal(f(c))$, where the natural extension of ''f'' to the hyperreals is still denoted ''f''. Alternatively, the property of microcontinuity at ''c'' can be expressed by stating that the composition $\backslash text\backslash circ\; f$ is constant of the halo of ''c'', where "st" is the standard part function. ==History== The modern property of continuity of a function was first defined by Bolzano in 1817. However, Bolzano's work was not noticed by the larger mathematical community until its rediscovery in Heine in the 1860s. Meanwhile, Cauchy's textbook Cours d'Analyse defined continuity in 1821 using infinitesimals as above.〔.〕 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「Microcontinuity」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.