Description: The set of vertices of a graph represented as an ordered pair of vertices and indexed edges as operation value. (Contributed by AV, 21-Sep-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | opvtxov | |- ( ( V e. X /\ E e. Y ) -> ( V Vtx E ) = V ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ov | |- ( V Vtx E ) = ( Vtx ` <. V , E >. ) |
|
2 | opvtxfv | |- ( ( V e. X /\ E e. Y ) -> ( Vtx ` <. V , E >. ) = V ) |
|
3 | 1 2 | syl5eq | |- ( ( V e. X /\ E e. Y ) -> ( V Vtx E ) = V ) |