Step |
Hyp |
Ref |
Expression |
1 |
|
brabgaf.0 |
|
2 |
|
brabgaf.1 |
|
3 |
|
brabgaf.2 |
|
4 |
|
df-br |
|
5 |
3
|
eleq2i |
|
6 |
4 5
|
bitri |
|
7 |
|
elopab |
|
8 |
|
elisset |
|
9 |
|
elisset |
|
10 |
|
exdistrv |
|
11 |
|
nfe1 |
|
12 |
11 1
|
nfbi |
|
13 |
|
nfe1 |
|
14 |
13
|
nfex |
|
15 |
|
nfv |
|
16 |
14 15
|
nfbi |
|
17 |
|
opeq12 |
|
18 |
|
copsexgw |
|
19 |
18
|
eqcoms |
|
20 |
17 19
|
syl |
|
21 |
20 2
|
bitr3d |
|
22 |
16 21
|
exlimi |
|
23 |
12 22
|
exlimi |
|
24 |
10 23
|
sylbir |
|
25 |
8 9 24
|
syl2an |
|
26 |
7 25
|
syl5bb |
|
27 |
6 26
|
syl5bb |
|