Description: The edge function of a simple graph is a bijective function onto its range. (Contributed by Alexander van der Vekens, 18-Nov-2017) (Revised by AV, 15-Oct-2020)
Ref | Expression | ||
---|---|---|---|
Hypothesis | usgrf1o.e | ||
Assertion | usgrf1o |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | usgrf1o.e | ||
2 | eqid | ||
3 | 2 1 | usgrfs | |
4 | f1f1orn | ||
5 | 3 4 | syl |