About
An identity function is an algebraic law that defines when the output of the function is equal to the input.
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Linear Algebra
For any domain D: each domain element d map to itself:
| <math>id_D : D \rightarrow D</math> |  |
Example
Addition (+) <MATH> x+0 = x </MATH>
Division: (/) <MATH> \frac{x}{1} = x </MATH>