Step |
Hyp |
Ref |
Expression |
1 |
|
df-nel |
|
2 |
|
ianor |
|
3 |
1 2
|
orbi12i |
|
4 |
|
df-nel |
|
5 |
|
elnnne0 |
|
6 |
4 5
|
xchbinx |
|
7 |
6
|
orbi2i |
|
8 |
|
orass |
|
9 |
3 7 8
|
3bitr4i |
|
10 |
|
ianor |
|
11 |
|
orcom |
|
12 |
10 11
|
bitri |
|
13 |
|
df-clwwlkn |
|
14 |
13
|
mpondm0 |
|
15 |
12 14
|
sylbir |
|
16 |
|
nne |
|
17 |
|
oveq1 |
|
18 |
|
clwwlkn0 |
|
19 |
17 18
|
eqtrdi |
|
20 |
16 19
|
sylbi |
|
21 |
15 20
|
jaoi |
|
22 |
9 21
|
sylbi |
|