Step |
Hyp |
Ref |
Expression |
1 |
|
relopabv |
|
2 |
|
reldif |
|
3 |
1 2
|
ax-mp |
|
4 |
|
relopabv |
|
5 |
|
sban |
|
6 |
|
sban |
|
7 |
6
|
sbbii |
|
8 |
|
vopelopabsb |
|
9 |
|
sbn |
|
10 |
|
sbn |
|
11 |
10
|
sbbii |
|
12 |
|
vopelopabsb |
|
13 |
12
|
notbii |
|
14 |
9 11 13
|
3bitr4ri |
|
15 |
8 14
|
anbi12i |
|
16 |
5 7 15
|
3bitr4ri |
|
17 |
|
eldif |
|
18 |
|
vopelopabsb |
|
19 |
16 17 18
|
3bitr4i |
|
20 |
3 4 19
|
eqrelriiv |
|