Step |
Hyp |
Ref |
Expression |
1 |
|
nfcv |
|
2 |
|
nfcv |
|
3 |
|
fveqeq2 |
|
4 |
|
fveq2 |
|
5 |
3 4
|
ifbieq2d |
|
6 |
1 2 5
|
cbvmpt |
|
7 |
|
nfcv |
|
8 |
|
nfcv |
|
9 |
|
nffvmpt1 |
|
10 |
8 9
|
nfxp |
|
11 |
|
sneq |
|
12 |
|
fveq2 |
|
13 |
11 12
|
xpeq12d |
|
14 |
7 10 13
|
cbvmpt |
|
15 |
|
nfcv |
|
16 |
|
nfcv |
|
17 |
|
nfcv |
|
18 |
|
nffvmpt1 |
|
19 |
17 18
|
nffv |
|
20 |
16 19
|
nffv |
|
21 |
|
2fveq3 |
|
22 |
21
|
fveq2d |
|
23 |
15 20 22
|
cbvmpt |
|
24 |
6 14 23
|
axcc2lem |
|