Step |
Hyp |
Ref |
Expression |
1 |
|
sssucid |
|
2 |
|
trel |
|
3 |
2
|
expd |
|
4 |
3
|
adantrd |
|
5 |
|
ssel |
|
6 |
1 4 5
|
ee03 |
|
7 |
|
simpl |
|
8 |
7
|
a1i |
|
9 |
|
eleq2 |
|
10 |
9
|
biimpcd |
|
11 |
8 10
|
syl6 |
|
12 |
1 11 5
|
ee03 |
|
13 |
|
simpr |
|
14 |
13
|
a1i |
|
15 |
|
elsuci |
|
16 |
14 15
|
syl6 |
|
17 |
|
jao |
|
18 |
6 12 16 17
|
ee222 |
|
19 |
18
|
alrimivv |
|
20 |
|
dftr2 |
|
21 |
19 20
|
sylibr |
|