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In mathematics, the field with one element is a suggestive name for an object that should behave similarly to a finite field with a single element, if such a field could exist. This object is denoted F1, or, in a French–English pun, Fun. The name "field with one element" and the notation F1 are only suggestive, as there is no field with one element in classical abstract algebra. Instead, F1 refers to the idea that there should be a way to replace sets and operations, the traditional building blocks for abstract algebra, with other, more flexible objects. While there is still no field with a single element in these theories, there is a field-like object whose characteristic is one.

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  • Campo con un elemento
  • Corps à un élément
  • 一元体
  • Field with one element
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  • In matematica, il campo con un elemento è un nome suggestivo per un oggetto che "dovrebbe" esistere: molti oggetti in matematica hanno proprietà analoghe a oggetti sopra un campo con elementi, dove e la analogia tra campi di numeri e campi di funzioni è più forte se si considera anche il campo con un elemento. Questo oggetto è indicato con .
  • In mathematics, the field with one element is a suggestive name for an object that should behave similarly to a finite field with a single element, if such a field could exist. This object is denoted F1, or, in a French–English pun, Fun. The name "field with one element" and the notation F1 are only suggestive, as there is no field with one element in classical abstract algebra. Instead, F1 refers to the idea that there should be a way to replace sets and operations, the traditional building blocks for abstract algebra, with other, more flexible objects. While there is still no field with a single element in these theories, there is a field-like object whose characteristic is one.
  • 数学において一元体(いちげんたい、英: field with one element)あるいは標数 1 の体 (field of characteristic one) とは、「ただひとつの元からなる有限体」と呼んでもおかしくない程に有限体と類似の性質を持つ数学的対象を示唆する仮想的な呼称である。しばしば、一元体を F1 あるいは Fun で表す。通常の抽象代数学的な意味での「ただひとつの元からなる体」は存在せず、「一元体」の呼称や「F1」といった表示はあくまで示唆的なものでしかないということには留意すべきである。その代わり、F1 の概念は、抽象代数学を形作る旧来の材料である「集合と作用」が、もっとほかのより柔軟な数学的対象で置き換わるべきといった方法論を提供するものと考えられている。そういった新しい枠組みにおける理論で一元体を実現しているようなものは未だ存在していないが、標数 1 の体に類似した対象についてはいくつか知られており、それらの対象もやはり用語を流用して象徴的に一元体 F1 と呼ばれている。なお、一元体上の数学は日本の黒川信重ら一部の数学者によって、絶対数学と呼ばれている。
  • En mathématiques, et plus précisément en géométrie algébrique, le corps à un élément est le nom donné de manière quelque peu fantaisiste à un objet qui se comporterait comme un corps fini à un seul élément, si un tel corps pouvait exister. Cet objet est noté F1, ou parfois Fun. L'idée est qu'il devrait être possible de construire des théories dans lesquelles les ensembles et les lois de composition (qui constituent les bases de l'algèbre générale) seraient remplacés par d'autres objets plus flexibles. Bien que ces théories n'admettent pas elles non plus de corps à un élément, elles contiennent un objet ayant certaines propriétés des corps et dont la caractéristique (en un sens généralisé) vaut 1.
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