Identity

Identity[expr]

gives expr (the identity operation).

Examples

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Basic Examples  (1)

Applications  (1)

Plot a collection of functions together with the line:

Properties & Relations  (4)

Identity is removed from functional composition:

The first derivative of the identity is the constant 1:

Sequence acts as a general identity for several arguments:

Identity as a pure function:

Neat Examples  (1)

Tabulate square roots of values without using auxiliary variables:

Introduced in 1988
 (1.0)