Metamath Proof Explorer


Theorem subgrv

Description: If a class is a subgraph of another class, both classes are sets. (Contributed by AV, 16-Nov-2020)

Ref Expression
Assertion subgrv ( 𝑆 SubGraph 𝐺 → ( 𝑆 ∈ V ∧ 𝐺 ∈ V ) )

Proof

Step Hyp Ref Expression
1 relsubgr Rel SubGraph
2 1 brrelex12i ( 𝑆 SubGraph 𝐺 → ( 𝑆 ∈ V ∧ 𝐺 ∈ V ) )