Usually means: Maps every input to itself.
Definitions Related words Mentions
We found 10 dictionaries that define the word identity function:

General (6 matching dictionaries)
  1. identity function: Merriam-Webster
  2. identity function: American Heritage Dictionary of the English Language
  3. identity function: Wiktionary
  4. identity function: Dictionary.com
  5. Identity function: Wikipedia, the Free Encyclopedia
  6. identity function: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. identity function: Encyclopedia

Science (3 matching dictionaries)
  1. Identity Function: Eric Weisstein's World of Mathematics
  2. identity function: MATH SPOKEN HERE!
  3. identity function: PlanetMath Encyclopedia

Definitions from Wiktionary (identity function)

noun:  (mathematics) A function whose value is always the same as its independent variable, and for which the codomain equals the domain.

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