Description: Every member N of the closed neighborhood of a vertex K is a vertex. (Contributed by AV, 9-May-2025)
Ref | Expression | ||
---|---|---|---|
Hypothesis | clnbgrvtxel.v | ||
Assertion | clnbgrisvtx |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | clnbgrvtxel.v | ||
2 | eqid | ||
3 | 1 2 | clnbgrel | |
4 | simpll | ||
5 | 3 4 | sylbi |