Step |
Hyp |
Ref |
Expression |
1 |
|
orcom |
|
2 |
1
|
a1i |
|
3 |
|
onsseleq |
|
4 |
|
ontri1 |
|
5 |
2 3 4
|
3bitr2d |
|
6 |
5
|
con2bid |
|
7 |
6
|
ancoms |
|
8 |
4
|
ancoms |
|
9 |
|
ontri1 |
|
10 |
8 9
|
anbi12d |
|
11 |
|
eqss |
|
12 |
|
ioran |
|
13 |
10 11 12
|
3bitr4g |
|
14 |
|
equcom |
|
15 |
14
|
orbi2i |
|
16 |
15
|
a1i |
|
17 |
|
onsseleq |
|
18 |
16 17 9
|
3bitr2d |
|
19 |
18
|
con2bid |
|
20 |
7 13 19
|
3jca |
|
21 |
20
|
rgen2 |
|