Step |
Hyp |
Ref |
Expression |
1 |
|
impexp |
|
2 |
1
|
albii |
|
3 |
|
19.21v |
|
4 |
|
vex |
|
5 |
|
vex |
|
6 |
4 5
|
opelco |
|
7 |
|
df-br |
|
8 |
|
brv |
|
9 |
|
brdif |
|
10 |
8 9
|
mpbiran |
|
11 |
5
|
ideq |
|
12 |
|
equcom |
|
13 |
11 12
|
bitri |
|
14 |
10 13
|
xchbinx |
|
15 |
7 14
|
anbi12i |
|
16 |
15
|
exbii |
|
17 |
|
exanali |
|
18 |
6 16 17
|
3bitri |
|
19 |
18
|
con2bii |
|
20 |
|
opex |
|
21 |
|
eldif |
|
22 |
20 21
|
mpbiran |
|
23 |
19 22
|
bitr4i |
|
24 |
23
|
imbi2i |
|
25 |
2 3 24
|
3bitri |
|
26 |
25
|
2albii |
|
27 |
|
ssrel |
|
28 |
26 27
|
bitr4id |
|
29 |
28
|
pm5.32i |
|
30 |
|
dffun4 |
|
31 |
|
sscoid |
|
32 |
29 30 31
|
3bitr4i |
|