Last Updated
：2025/11/30
identity functor
（ plural ）
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(category theory) A functor from a category to itself which maps each object of that category to itself and each morphism of that category to itself.
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identity functor
In many categories, the identity functor serves as the neutral element for composition of endofunctors.
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In many categories, the identity functor serves as the neutral element for composition of endofunctors.
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