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 |
|