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In mathematics, the word ''undefined'' has several different meanings, depending on the context. * In geometry, simple words such as "point" and "line" are taken as undefined terms. * In arithmetic, some arithmetic operations are called "undefined". Two of the more famous examples are division by zero and zero to the power of zero. * In algebra, a function is said to be "undefined" at points not in its domain. For example, in the real number system, is undefined for negative , i.e., no such values exist for function . ==Undefined terms in geometry== In ancient times, geometers attempted to define every term. For example, Euclid defined a point as "that which has no part". In modern times, mathematicians recognized that attempting to define every word inevitably led to circular definitions, and therefore left some terms, "point" for example, as undefined (see primitive notion). 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「Undefined (mathematics)」の詳細全文を読む スポンサード リンク
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