Step |
Hyp |
Ref |
Expression |
1 |
|
cusgrfi.v |
|
2 |
|
cusgrfi.p |
|
3 |
|
eqid |
|
4 |
1 3
|
cusgredg |
|
5 |
|
fveq2 |
|
6 |
5
|
ad2antlr |
|
7 |
|
hashprg |
|
8 |
7
|
adantrr |
|
9 |
8
|
biimpcd |
|
10 |
9
|
adantr |
|
11 |
10
|
imp |
|
12 |
6 11
|
eqtrd |
|
13 |
12
|
an13s |
|
14 |
13
|
rexlimdvaa |
|
15 |
14
|
ss2rabdv |
|
16 |
2
|
a1i |
|
17 |
|
id |
|
18 |
16 17
|
sseq12d |
|
19 |
15 18
|
syl5ibr |
|
20 |
4 19
|
syl |
|
21 |
20
|
imp |
|