Step |
Hyp |
Ref |
Expression |
1 |
|
cnex |
|
2 |
|
reex |
|
3 |
|
elpm2r |
|
4 |
1 2 3
|
mpanl12 |
|
5 |
|
elo1 |
|
6 |
5
|
baib |
|
7 |
4 6
|
syl |
|
8 |
|
elin |
|
9 |
|
fdm |
|
10 |
9
|
ad3antrrr |
|
11 |
10
|
eleq2d |
|
12 |
11
|
anbi1d |
|
13 |
|
simpllr |
|
14 |
13
|
sselda |
|
15 |
|
simpllr |
|
16 |
|
elicopnf |
|
17 |
15 16
|
syl |
|
18 |
14 17
|
mpbirand |
|
19 |
18
|
pm5.32da |
|
20 |
12 19
|
bitrd |
|
21 |
8 20
|
syl5bb |
|
22 |
21
|
imbi1d |
|
23 |
|
impexp |
|
24 |
22 23
|
bitrdi |
|
25 |
24
|
ralbidv2 |
|
26 |
25
|
rexbidva |
|
27 |
26
|
rexbidva |
|
28 |
7 27
|
bitrd |
|