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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 Essential singularity ： ウィキペディア英語版 Essential singularity In complex analysis, an essential singularity of a function is a "severe" singularity near which the function exhibits odd behavior. The category ''essential singularity'' is a "left-over" or default group of singularities that are especially unmanageable: by definition they fit into neither of the other two categories of singularity that may be dealt with in some manner – removable singularities and poles. ==Formal description== Consider an open subset ''U'' of the complex plane C. Let ''a'' be an element of ''U'', and ''f'' : ''U'' \  → C a holomorphic function. The point ''a'' is called an ''essential singularity'' of the function ''f'' if the singularity is neither a pole nor a removable singularity. For example, the function ''f''(''z'') = ''e''1/''z'' has an essential singularity at ''z'' = 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「Essential singularity」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.