| 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 |
|