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Built-in Mathematica Symbol

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OneIdentity

OneIdentity
is an attribute that can be assigned to a symbol f to indicate that f[x], f[f[x]], etc. are all equivalent to x for the purpose of pattern matching.

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OneIdentity has an effect only if f has attribute Flat.

Functions like Plus and Times have the attribute OneIdentity.

The fact that Times has attribute OneIdentity allows a pattern like n_.x_ to match x.

SEE ALSO

Flat Nest

TUTORIALS

Flat and Orderless Functions

Attributes

Patterns and Transformation Rules

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Attributes

Patterns

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