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Self-map

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Summary

A function f:X→Xf:X\to X whose domain and codomain are the same set. Iterating a self-map supplies the standard deterministic discrete-time evolution.

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FunctionSelf-map

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This is an authored directed relation from the source endpoint to the target endpoint.

Authored explanation

Restrict a function f:X→Yf:X\to Y by requiring Y=XY=X. The resulting endofunction can be iterated, whereas an arbitrary function with different domain and codomain cannot be composed with itself.

How to interpret this relation type

Keep the existing data and select the subclass satisfying an additional law, existence condition, finiteness condition, or other property.

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Self-mapDiscrete-time dynamical system

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This is an authored directed relation from the source endpoint to the target endpoint.

Authored explanation

A self-map generates an N\mathbb N-action by iteration, and specifying such a forward discrete action is equivalent to specifying its one-step map. A Z\mathbb Z-action additionally requires an invertible map.

How to interpret this relation type

Reinterpret an object, pass to an equivalent presentation, or relate canonically corresponding structures; the carrier may change.

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