Step |
Hyp |
Ref |
Expression |
1 |
|
dfon2 |
|
2 |
|
abeq1 |
|
3 |
|
vex |
|
4 |
3
|
elrn |
|
5 |
|
brin |
|
6 |
3
|
brsset |
|
7 |
|
brxp |
|
8 |
3 7
|
mpbiran2 |
|
9 |
|
vex |
|
10 |
9
|
eltrans |
|
11 |
8 10
|
bitri |
|
12 |
6 11
|
anbi12i |
|
13 |
5 12
|
bitri |
|
14 |
|
ioran |
|
15 |
|
brun |
|
16 |
3
|
ideq |
|
17 |
|
epel |
|
18 |
16 17
|
orbi12i |
|
19 |
15 18
|
bitri |
|
20 |
14 19
|
xchnxbir |
|
21 |
13 20
|
anbi12i |
|
22 |
|
brdif |
|
23 |
|
dfpss2 |
|
24 |
23
|
anbi1i |
|
25 |
|
an32 |
|
26 |
24 25
|
bitri |
|
27 |
26
|
anbi1i |
|
28 |
|
anass |
|
29 |
27 28
|
bitri |
|
30 |
21 22 29
|
3bitr4i |
|
31 |
30
|
exbii |
|
32 |
|
exanali |
|
33 |
31 32
|
bitri |
|
34 |
4 33
|
bitri |
|
35 |
34
|
con2bii |
|
36 |
|
eldif |
|
37 |
3 36
|
mpbiran |
|
38 |
35 37
|
bitr4i |
|
39 |
2 38
|
mpgbir |
|
40 |
1 39
|
eqtri |
|