identity function
Sign in to saveAlso known as identity map, identity transformation, identity operator, id, identity relation
function that always returns the same value that was used as its argument
Wikidata facts
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- TeX string
- \operatorname{id}
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- WikiProject Mathematics
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Encyclopedic overview
Graph of the identity function on the real numbers
In mathematics, an identity function, also called an identity relation, identity map or identity transformation, is a function that always returns the value that was used as its argument, unchanged. That is, when
Excerpted from Wikipedia’s “identity function” article, available under the CC BY-SA 4.0 licence.