| 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 |
|