Description: The set of vertices in a graph (simple pseudograph) with one edge which is a loop (see uspgr1v1eop ). (Contributed by AV, 17-Dec-2020)
Ref | Expression | ||
---|---|---|---|
Hypothesis | uspgrloopvtx.g | ||
Assertion | uspgrloopvtx |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | uspgrloopvtx.g | ||
2 | 1 | fveq2i | |
3 | snex | ||
4 | opvtxfv | ||
5 | 3 4 | mpan2 | |
6 | 2 5 | syl5eq |