Step |
Hyp |
Ref |
Expression |
1 |
|
breq1 |
|
2 |
|
eqeq1 |
|
3 |
|
breq2 |
|
4 |
1 2 3
|
3orbi123d |
|
5 |
4
|
imbi2d |
|
6 |
|
breq2 |
|
7 |
|
eqeq2 |
|
8 |
|
breq1 |
|
9 |
6 7 8
|
3orbi123d |
|
10 |
9
|
imbi2d |
|
11 |
|
df-so |
|
12 |
|
breq1 |
|
13 |
|
equequ1 |
|
14 |
|
breq2 |
|
15 |
12 13 14
|
3orbi123d |
|
16 |
15
|
ralbidv |
|
17 |
16
|
rspw |
|
18 |
|
breq2 |
|
19 |
|
equequ2 |
|
20 |
|
breq1 |
|
21 |
18 19 20
|
3orbi123d |
|
22 |
21
|
rspw |
|
23 |
17 22
|
syl6 |
|
24 |
23
|
impd |
|
25 |
11 24
|
simplbiim |
|
26 |
25
|
com12 |
|
27 |
5 10 26
|
vtocl2ga |
|
28 |
27
|
impcom |
|