Description: Every neighbor N of a vertex K is a vertex. (Contributed by Alexander van der Vekens, 12-Oct-2017) (Revised by AV, 26-Oct-2020) (Revised by AV, 12-Feb-2022)
Ref | Expression | ||
---|---|---|---|
Hypothesis | nbgrisvtx.v | ||
Assertion | nbgrisvtx |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nbgrisvtx.v | ||
2 | eqid | ||
3 | 1 2 | nbgrel | |
4 | simp1l | ||
5 | 3 4 | sylbi |