Step |
Hyp |
Ref |
Expression |
1 |
|
dfint2 |
|
2 |
|
ralnex |
|
3 |
|
vex |
|
4 |
|
vex |
|
5 |
3 4
|
brcnv |
|
6 |
|
brv |
|
7 |
|
brdif |
|
8 |
6 7
|
mpbiran |
|
9 |
5 8
|
bitr2i |
|
10 |
9
|
con1bii |
|
11 |
|
epel |
|
12 |
10 11
|
bitr2i |
|
13 |
12
|
ralbii |
|
14 |
|
eldif |
|
15 |
4 14
|
mpbiran |
|
16 |
4
|
elima |
|
17 |
15 16
|
xchbinx |
|
18 |
2 13 17
|
3bitr4ri |
|
19 |
18
|
abbi2i |
|
20 |
1 19
|
eqtr4i |
|