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Metamath Proof Explorer

Theorem ssv

Description: Any class is a subclass of the universal class. (Contributed by NM, 31-Oct-1995)

Ref Expression
Assertion ssv 𝐴 ⊆ V

Proof

Step Hyp Ref Expression
1 elex ⊢ ( 𝑥 ∈ 𝐴 → 𝑥 ∈ V )
2 1 ssriv ⊢ 𝐴 ⊆ V