Step |
Hyp |
Ref |
Expression |
1 |
|
eleq12 |
|
2 |
1
|
anidms |
|
3 |
2
|
notbid |
|
4 |
3
|
cbvrabv |
|
5 |
4
|
eleq2i |
|
6 |
|
elex |
|
7 |
|
elex |
|
8 |
7
|
adantr |
|
9 |
|
eleq1 |
|
10 |
|
id |
|
11 |
10 10
|
eleq12d |
|
12 |
11
|
notbid |
|
13 |
9 12
|
anbi12d |
|
14 |
|
eleq1 |
|
15 |
|
eleq12 |
|
16 |
15
|
anidms |
|
17 |
16
|
notbid |
|
18 |
14 17
|
anbi12d |
|
19 |
|
df-rab |
|
20 |
13 18 19
|
elab2gw |
|
21 |
6 8 20
|
pm5.21nii |
|
22 |
5 21
|
bitri |
|
23 |
|
pclem6 |
|
24 |
22 23
|
ax-mp |
|