Description: Define the edge function (indexed edges) of a graph. (Contributed by AV, 18-Jan-2020) Use its index-independent form edgfid instead. (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | df-edgf | ⊢ .ef = Slot ; 1 8 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 0 | cedgf | ⊢ .ef | |
| 1 | c1 | ⊢ 1 | |
| 2 | c8 | ⊢ 8 | |
| 3 | 1 2 | cdc | ⊢ ; 1 8 |
| 4 | 3 | cslot | ⊢ Slot ; 1 8 |
| 5 | 0 4 | wceq | ⊢ .ef = Slot ; 1 8 |