Step |
Hyp |
Ref |
Expression |
1 |
|
qustriv.1 |
|
2 |
1
|
subgid |
|
3 |
|
eqid |
|
4 |
1 3
|
eqger |
|
5 |
|
errel |
|
6 |
2 4 5
|
3syl |
|
7 |
|
relxp |
|
8 |
7
|
a1i |
|
9 |
|
df-3an |
|
10 |
|
simpl |
|
11 |
|
eqid |
|
12 |
1 11
|
grpinvcl |
|
13 |
12
|
adantrr |
|
14 |
|
simprr |
|
15 |
|
eqid |
|
16 |
1 15
|
grpcl |
|
17 |
10 13 14 16
|
syl3anc |
|
18 |
17
|
ex |
|
19 |
18
|
pm4.71d |
|
20 |
9 19
|
bitr4id |
|
21 |
|
ssid |
|
22 |
1 11 15 3
|
eqgval |
|
23 |
21 22
|
mpan2 |
|
24 |
|
brxp |
|
25 |
24
|
a1i |
|
26 |
20 23 25
|
3bitr4d |
|
27 |
6 8 26
|
eqbrrdv |
|