Step |
Hyp |
Ref |
Expression |
1 |
|
fvopab5.1 |
|
2 |
|
fvopab5.2 |
|
3 |
|
elex |
|
4 |
|
df-fv |
|
5 |
|
breq2 |
|
6 |
|
nfcv |
|
7 |
|
nfopab2 |
|
8 |
1 7
|
nfcxfr |
|
9 |
|
nfcv |
|
10 |
6 8 9
|
nfbr |
|
11 |
|
nfv |
|
12 |
5 10 11
|
cbviotaw |
|
13 |
4 12
|
eqtri |
|
14 |
|
nfcv |
|
15 |
|
nfopab1 |
|
16 |
1 15
|
nfcxfr |
|
17 |
|
nfcv |
|
18 |
14 16 17
|
nfbr |
|
19 |
|
nfv |
|
20 |
18 19
|
nfbi |
|
21 |
|
breq1 |
|
22 |
21 2
|
bibi12d |
|
23 |
|
df-br |
|
24 |
1
|
eleq2i |
|
25 |
|
opabidw |
|
26 |
23 24 25
|
3bitri |
|
27 |
20 22 26
|
vtoclg1f |
|
28 |
27
|
iotabidv |
|
29 |
13 28
|
syl5eq |
|
30 |
3 29
|
syl |
|