Step |
Hyp |
Ref |
Expression |
1 |
|
fiun.1 |
|
2 |
|
vex |
|
3 |
|
eqeq1 |
|
4 |
3
|
rexbidv |
|
5 |
2 4
|
elab |
|
6 |
1
|
eqeq2d |
|
7 |
6
|
cbvrexvw |
|
8 |
|
r19.29 |
|
9 |
|
sseq12 |
|
10 |
9
|
ancoms |
|
11 |
|
sseq12 |
|
12 |
10 11
|
orbi12d |
|
13 |
12
|
biimprcd |
|
14 |
13
|
expdimp |
|
15 |
14
|
rexlimivw |
|
16 |
15
|
imp |
|
17 |
8 16
|
sylan |
|
18 |
17
|
an32s |
|
19 |
18
|
adantlll |
|
20 |
7 19
|
sylan2b |
|
21 |
5 20
|
sylan2b |
|
22 |
21
|
ralrimiva |
|