As a logical concept, (1) a set of objects to which cognition is applied. In this case, there is the extension of a concept and the extension of a proposition. In the former case, it refers to a set of individuals that satisfy the concept, but traditional logic defined extension only for concepts. However, in the new semantics beginning with Frege, the extension of a proposition is considered, and the truth value of a proposition is its extension. (2) The extension of the object or set of individuals considered in a logical operation, that is, the noun in a proposition, is only a part of the whole extension of the proposition. (3) A characteristic that a proposition has whether it is a singular (including collective) proposition or a plural proposition. If the proposition is a plural or collective proposition, it can be considered to be a more or less general proposition. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
論理学的概念としては,(1) 認識がそれに適用さるべき対象の集合。その場合,概念の外延と命題の外延とがあり,前者の場合はその概念を満足する個体の集合をいうが,伝統的論理学では概念に対してのみ外延を定義した。しかしフレーゲに始る新しい意味論においては命題の外延を考え,その際,命題の真理値がその外延となる。 (2) 論理的操作において考えられた対象ないし個別の集合,つまり命題における賓辞 (ひんじ) の外延は,その命題の外延の全体の一部にすぎない。 (3) ある命題が,単数 (集合的な場合も含めて) 命題か,複数命題かでもつ特徴。もしその命題が複数,ないし集合的な命題であれば,その命題は多かれ少なかれ,一般的な命題であると考えられる。
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