Description: Lemma for prter1 , prter2 , prter3 and prtex . (Contributed by Rodolfo Medina, 13-Oct-2010) (Revised by Mario Carneiro, 12-Aug-2015)
Ref | Expression | ||
---|---|---|---|
Hypothesis | prtlem13.1 | |
|
Assertion | prtlem13 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | prtlem13.1 | |
|
2 | vex | |
|
3 | vex | |
|
4 | elequ2 | |
|
5 | elequ2 | |
|
6 | 4 5 | anbi12d | |
7 | 6 | cbvrexvw | |
8 | elequ1 | |
|
9 | elequ1 | |
|
10 | 8 9 | bi2anan9 | |
11 | 10 | rexbidv | |
12 | 7 11 | syl5bb | |
13 | 2 3 12 1 | braba | |