Step |
Hyp |
Ref |
Expression |
1 |
|
ssc2.1 |
|
2 |
|
ssc2.2 |
|
3 |
|
ssc2.3 |
|
4 |
|
ssc2.4 |
|
5 |
|
eqidd |
|
6 |
2 5
|
sscfn2 |
|
7 |
|
sscrel |
|
8 |
7
|
brrelex2i |
|
9 |
|
dmexg |
|
10 |
|
dmexg |
|
11 |
2 8 9 10
|
4syl |
|
12 |
1 6 11
|
isssc |
|
13 |
2 12
|
mpbid |
|
14 |
13
|
simprd |
|
15 |
|
oveq1 |
|
16 |
|
oveq1 |
|
17 |
15 16
|
sseq12d |
|
18 |
|
oveq2 |
|
19 |
|
oveq2 |
|
20 |
18 19
|
sseq12d |
|
21 |
17 20
|
rspc2va |
|
22 |
3 4 14 21
|
syl21anc |
|