groupoid

noun

(algebra) A magma: a set with a total binary operation. / (algebra and category theory) A set with a partial binary operation that is associative and has identities and inverses.

A groupoid is a mathematical structure that generalizes the concept of a group.

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意味（1）

(algebra) A magma: a set with a total binary operation.

意味（2）

(algebra and category theory) A set with a partial binary operation that is associative and has identities and inverses.

… A category in which every morphism is an isomorphism is called a groupoid.

This means that a group is a groupoid with only one object. …

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groupoid

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