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
~3 min read
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.