+An **axiom** is a fundamental truth or proposition accepted without proof, serving as a self-evident starting point. It provides a foundational [Basic Principle](/wiki/basic_principle) upon which a [Formal System](/wiki/formal_system) of reasoning or mathematics is built.
+## See also
+- [Proof](/wiki/proof)
+- [Theorem](/wiki/theorem)
+- [Logic](/wiki/logic)
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