category

カテゴリー、分類

共通の特徴を持つ、または同じ種類とされる人や物の集まり。

やさしい英語で： A group of people or things that share a feature or are treated as the same type.

• Choose a category from the list.
• We divided the entries into three categories.
• Which category does this film belong to?

使い方： a category of something (This category of birds has long legs.); fall into a category (These books fall into the same category.)

類義語： group, type, class

よく使う表現： age category, different category, category of something, highest category

圏

対象とそれらを結ぶ矢印からなり、矢印の合成と恒等の規則を持つ数学的構造。

やさしい英語で： A mathematical system of objects and arrows linking them, with rules for joining arrows and leaving objects unchanged.

• This category contains only one object.
• The arrows in this category are functions.
• An identity arrow exists for every object in a category.

よく使う表現： small category, category theory, category of sets