| Step |
Hyp |
Ref |
Expression |
| 1 |
|
dvhset.h |
|
| 2 |
|
elex |
|
| 3 |
|
fveq2 |
|
| 4 |
3 1
|
eqtr4di |
|
| 5 |
|
fveq2 |
|
| 6 |
5
|
fveq1d |
|
| 7 |
|
fveq2 |
|
| 8 |
7
|
fveq1d |
|
| 9 |
6 8
|
xpeq12d |
|
| 10 |
9
|
opeq2d |
|
| 11 |
6
|
mpteq1d |
|
| 12 |
11
|
opeq2d |
|
| 13 |
9 9 12
|
mpoeq123dv |
|
| 14 |
13
|
opeq2d |
|
| 15 |
|
fveq2 |
|
| 16 |
15
|
fveq1d |
|
| 17 |
16
|
opeq2d |
|
| 18 |
10 14 17
|
tpeq123d |
|
| 19 |
|
eqidd |
|
| 20 |
8 9 19
|
mpoeq123dv |
|
| 21 |
20
|
opeq2d |
|
| 22 |
21
|
sneqd |
|
| 23 |
18 22
|
uneq12d |
|
| 24 |
4 23
|
mpteq12dv |
|
| 25 |
|
df-dvech |
|
| 26 |
24 25 1
|
mptfvmpt |
|
| 27 |
2 26
|
syl |
|