Step |
Hyp |
Ref |
Expression |
1 |
|
copsex2g.1 |
|
2 |
|
elisset |
|
3 |
|
elisset |
|
4 |
|
exdistrv |
|
5 |
|
nfe1 |
|
6 |
|
nfv |
|
7 |
5 6
|
nfbi |
|
8 |
|
nfe1 |
|
9 |
8
|
nfex |
|
10 |
|
nfv |
|
11 |
9 10
|
nfbi |
|
12 |
|
opeq12 |
|
13 |
|
copsexgw |
|
14 |
13
|
eqcoms |
|
15 |
12 14
|
syl |
|
16 |
15 1
|
bitr3d |
|
17 |
11 16
|
exlimi |
|
18 |
7 17
|
exlimi |
|
19 |
4 18
|
sylbir |
|
20 |
2 3 19
|
syl2an |
|