(a) Let α and β be two von Neumann ordinals. Show that α ⊂ β if and only if α ∈ β.(adsbygoogle = window.adsbygoogle || []).push({});

(b) Show that the Axiom of Foundation implies that a transitive set which is linearly ordered by ∈ is an ordinal

I can't seem to follow through this properly, any help?

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# Let α and β be two von Neumann ordinals

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