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 C_ _V

Proof

Step Hyp Ref Expression
1 elex 
 |-  ( x e. A -> x e. _V )
2 1 ssriv 
 |-  A C_ _V