Axiom of regularity
= Axiom of regularity
{c}
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= Axiom of foundation
{c}
{synonym}
= Foundation
{synonym}
Every nonempty set $A$ has an element $x\in A$ such that $x\cap A=\varnothing$.
= Axiom of regularity
{c}
{wiki}
= Axiom of foundation
{c}
{synonym}
= Foundation
{synonym}
Every nonempty set $A$ has an element $x\in A$ such that $x\cap A=\varnothing$.