Description: The set of the universal vertices is a subset of the set of all vertices. (Contributed by AV, 23-Dec-2020)
Ref | Expression | ||
---|---|---|---|
Hypothesis | uvtxel.v | ||
Assertion | uvtxssvtx |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | uvtxel.v | ||
2 | 1 | uvtxisvtx | |
3 | 2 | ssriv |