Step |
Hyp |
Ref |
Expression |
1 |
|
elex |
|
2 |
|
elex |
|
3 |
1 2
|
anim12i |
|
4 |
|
elex |
|
5 |
|
elex |
|
6 |
4 5
|
anim12i |
|
7 |
|
neeq1 |
|
8 |
|
opeq1 |
|
9 |
8
|
preq1d |
|
10 |
|
preq1 |
|
11 |
9 10
|
feq12d |
|
12 |
7 11
|
imbi12d |
|
13 |
|
neeq2 |
|
14 |
|
opeq1 |
|
15 |
14
|
preq2d |
|
16 |
|
preq2 |
|
17 |
15 16
|
feq12d |
|
18 |
13 17
|
imbi12d |
|
19 |
|
opeq2 |
|
20 |
19
|
preq1d |
|
21 |
|
eqidd |
|
22 |
|
preq1 |
|
23 |
20 21 22
|
feq123d |
|
24 |
23
|
imbi2d |
|
25 |
|
opeq2 |
|
26 |
25
|
preq2d |
|
27 |
|
eqidd |
|
28 |
|
preq2 |
|
29 |
26 27 28
|
feq123d |
|
30 |
29
|
imbi2d |
|
31 |
|
0ex |
|
32 |
31
|
elimel |
|
33 |
31
|
elimel |
|
34 |
31
|
elimel |
|
35 |
31
|
elimel |
|
36 |
32 33 34 35
|
fpr |
|
37 |
12 18 24 30 36
|
dedth4h |
|
38 |
3 6 37
|
syl2an |
|
39 |
38
|
3impia |
|