| Step |
Hyp |
Ref |
Expression |
| 1 |
|
dftr2 |
|
| 2 |
|
sssucid |
|
| 3 |
|
idn1 |
|
| 4 |
|
idn2 |
|
| 5 |
|
simpl |
|
| 6 |
4 5
|
e2 |
|
| 7 |
|
idn3 |
|
| 8 |
|
trel |
|
| 9 |
8
|
expd |
|
| 10 |
3 6 7 9
|
e123 |
|
| 11 |
|
ssel |
|
| 12 |
2 10 11
|
e03 |
|
| 13 |
12
|
in3 |
|
| 14 |
|
idn3 |
|
| 15 |
|
eleq2 |
|
| 16 |
15
|
biimpcd |
|
| 17 |
6 14 16
|
e23 |
|
| 18 |
2 17 11
|
e03 |
|
| 19 |
18
|
in3 |
|
| 20 |
|
simpr |
|
| 21 |
4 20
|
e2 |
|
| 22 |
|
elsuci |
|
| 23 |
21 22
|
e2 |
|
| 24 |
|
jao |
|
| 25 |
13 19 23 24
|
e222 |
|
| 26 |
25
|
in2 |
|
| 27 |
26
|
gen12 |
|
| 28 |
|
biimpr |
|
| 29 |
1 27 28
|
e01 |
|
| 30 |
29
|
in1 |
|