View source for Axiom schema

In [[mathematical logic]], an '''axiom schema''' (plural: '''axiom schemata''') generalizes the notion of [[axiom]].

== Formal definition ==

An axiom schema is a [[Well-formed formula|formula]] in the language of an [[axiomatic system]], in which one or more [[Metavariable|schematic variables]] appear.

These variables, which are metalinguistic constructs, stand for any term or subformula of the system, which may or may not be required to satisfy certain conditions. Often, such conditions require that certain variables be free, or that certain variables not appear in the subformula or term.

== See also ==

* [[Axiom]]
* [[Axiomatic system]]
* [[Axiom schema of predicative separation]]
* [[Axiom schema of replacement]]
* [[Axiom schema of specification]]
* [[Mathematical logic]]
* [[Metavariable]]
* [[Well-formed formula]]

== External links ==

* [https://en.wikipedia.org/wiki/Axiom_schema Axiom schema] @ Wikipedia.org 

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