Step |
Hyp |
Ref |
Expression |
1 |
|
cbvopab.1 |
|
2 |
|
cbvopab.2 |
|
3 |
|
cbvopab.3 |
|
4 |
|
cbvopab.4 |
|
5 |
|
cbvopab.5 |
|
6 |
|
nfv |
|
7 |
6 1
|
nfan |
|
8 |
|
nfv |
|
9 |
8 2
|
nfan |
|
10 |
|
nfv |
|
11 |
10 3
|
nfan |
|
12 |
|
nfv |
|
13 |
12 4
|
nfan |
|
14 |
|
opeq12 |
|
15 |
14
|
eqeq2d |
|
16 |
15 5
|
anbi12d |
|
17 |
7 9 11 13 16
|
cbvex2v |
|
18 |
17
|
abbii |
|
19 |
|
df-opab |
|
20 |
|
df-opab |
|
21 |
18 19 20
|
3eqtr4i |
|