Description: Lemma for rusgr1vtx . (Contributed by AV, 27-Dec-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | rusgr1vtxlem | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | r19.26 | |
|
2 | fveqeq2 | |
|
3 | 2 | biimpac | |
4 | 3 | ralimi | |
5 | hash1n0 | |
|
6 | rspn0 | |
|
7 | 5 6 | syl | |
8 | hash0 | |
|
9 | eqeq1 | |
|
10 | 8 9 | mpbii | |
11 | 7 10 | syl6com | |
12 | 4 11 | syl | |
13 | 1 12 | sylbir | |
14 | 13 | imp | |