Von Neumann Hierarchy is Cumulative
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Theorem
For any two ordinals $x$ and $y$,
If $x < y$ then $V(x) \subsetneqq V(y)$.
Proof
By Von Neumann Hierarchy Comparison, $V(x) \in V(y)$. (1)
By (1) and the Axiom:Axiom of Foundation, $V(x) \ne V(y)$.
Furthermore, by (1) and Von Neumann Hierarchy is Supertransitive,
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