Step |
Hyp |
Ref |
Expression |
1 |
|
oprabrexex2.1 |
|
2 |
|
oprabrexex2.2 |
|
3 |
|
df-oprab |
|
4 |
|
rexcom4 |
|
5 |
|
rexcom4 |
|
6 |
|
rexcom4 |
|
7 |
|
r19.42v |
|
8 |
7
|
exbii |
|
9 |
6 8
|
bitri |
|
10 |
9
|
exbii |
|
11 |
5 10
|
bitri |
|
12 |
11
|
exbii |
|
13 |
4 12
|
bitr2i |
|
14 |
13
|
abbii |
|
15 |
3 14
|
eqtri |
|
16 |
|
df-oprab |
|
17 |
16 2
|
eqeltrri |
|
18 |
1 17
|
abrexex2 |
|
19 |
15 18
|
eqeltri |
|