Step |
Hyp |
Ref |
Expression |
1 |
|
df-so |
|
2 |
|
opelxp |
|
3 |
|
brun |
|
4 |
|
vex |
|
5 |
4
|
ideq |
|
6 |
|
vex |
|
7 |
6 4
|
brcnv |
|
8 |
5 7
|
orbi12i |
|
9 |
3 8
|
bitr2i |
|
10 |
9
|
orbi2i |
|
11 |
|
3orass |
|
12 |
|
brun |
|
13 |
10 11 12
|
3bitr4i |
|
14 |
|
df-br |
|
15 |
13 14
|
bitr2i |
|
16 |
2 15
|
imbi12i |
|
17 |
16
|
2albii |
|
18 |
|
relxp |
|
19 |
|
ssrel |
|
20 |
18 19
|
ax-mp |
|
21 |
|
r2al |
|
22 |
17 20 21
|
3bitr4i |
|
23 |
22
|
anbi2i |
|
24 |
1 23
|
bitr4i |
|