伴随函子 Adjoint functors
（重定向自Adjoint functor）
在范畴论中，函子
若满足
，则称之为一对伴随函子，其中
称为
的右伴随函子，而是的左伴随函子。伴随函子在范畴论中是个极基本而有用的概念。
Adjoint functor
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Adjoint functors 伴随函子
（重定向自Adjoint functor）
In mathematics, specifically category theory, adjunction is a possible relationship between two functors.
Adjunction is ubiquitous in mathematics, as it specifies intuitive notions of optimization and efficiency.
In the most concise symmetric definition, an adjunction between categories C and D is a pair of functors,
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