identity functor
An inner suburb of the City of Manchester, Greater Manchester, England (OS grid ref SD8500).
plural of perfriction
(informal) A small amount of no worth.
(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.
多くの圏において、すべての対象とすべての射をそれ自身に写す関手（恒等関手）は、終自己函手の合成における単位元として機能します。
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DiQt
Free
★★★★★★★★★★
