Step |
Hyp |
Ref |
Expression |
1 |
|
hoicoto2.i |
|
2 |
|
hoicoto2.a |
|
3 |
|
hoicoto2.b |
|
4 |
1
|
adantr |
|
5 |
|
simpr |
|
6 |
4 5
|
fvovco |
|
7 |
1
|
ffvelrnda |
|
8 |
|
xp1st |
|
9 |
7 8
|
syl |
|
10 |
9
|
elexd |
|
11 |
2
|
fvmpt2 |
|
12 |
5 10 11
|
syl2anc |
|
13 |
12
|
eqcomd |
|
14 |
|
xp2nd |
|
15 |
7 14
|
syl |
|
16 |
15
|
elexd |
|
17 |
3
|
fvmpt2 |
|
18 |
5 16 17
|
syl2anc |
|
19 |
18
|
eqcomd |
|
20 |
13 19
|
oveq12d |
|
21 |
6 20
|
eqtrd |
|
22 |
21
|
ixpeq2dva |
|