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 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ov | ||
2 | opvtxfv | ||
3 | 1 2 | syl5eq |