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Noun
1. identity function; identity operatorMathematics
Wikipedia definition
2. Identity functionIn mathematics, an identity function, also called identity map or identity transformation, is a function that always returns the same value that was used as its argument. In terms of equations, the function is given by f(x) = x.
Read “Identity function” on English Wikipedia
Read “恒等関数” on Japanese Wikipedia
Read “Identity function” on DBpedia

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