Axiom of regularity

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What Wikipedia says

In mathematics, the axiom of regularity (also known as the axiom of foundation) is an axiom of Zermelo–Fraenkel set theory that states that every non-empty set A contains an element that is disjoint from A. In first-order logic, the axiom reads:

Excerpt from the Wikipedia article “Axiom of regularity”, under the CC BY-SA 4.0 license. Read the article on Wikipedia