Step |
Hyp |
Ref |
Expression |
1 |
|
oppcval.b |
|
2 |
|
oppcval.h |
|
3 |
|
oppcval.x |
|
4 |
|
oppcval.o |
|
5 |
|
elex |
|
6 |
|
id |
|
7 |
|
fveq2 |
|
8 |
7 2
|
eqtr4di |
|
9 |
8
|
tposeqd |
|
10 |
9
|
opeq2d |
|
11 |
6 10
|
oveq12d |
|
12 |
|
fveq2 |
|
13 |
12 1
|
eqtr4di |
|
14 |
13
|
sqxpeqd |
|
15 |
|
fveq2 |
|
16 |
15 3
|
eqtr4di |
|
17 |
16
|
oveqd |
|
18 |
17
|
tposeqd |
|
19 |
14 13 18
|
mpoeq123dv |
|
20 |
19
|
opeq2d |
|
21 |
11 20
|
oveq12d |
|
22 |
|
df-oppc |
|
23 |
|
ovex |
|
24 |
21 22 23
|
fvmpt |
|
25 |
5 24
|
syl |
|
26 |
4 25
|
eqtrid |
|