# Axiom:Axiom of Extension/Also known as

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## Axiom of Extension: Also known as

The **axiom of extension** is also known as:

- the
**axiom of extensionality** - the
**axiom of extent**.

## Sources

- 1964: W.E. Deskins:
*Abstract Algebra*... (previous) ... (next): Chapter $1$: A Common Language: $\S 1.1$ Sets