Step |
Hyp |
Ref |
Expression |
1 |
|
iscring2.1 |
|
2 |
|
iscring2.2 |
|
3 |
|
iscring2.3 |
|
4 |
|
iscrngo |
|
5 |
|
relrngo |
|
6 |
|
1st2nd |
|
7 |
5 6
|
mpan |
|
8 |
|
eleq1 |
|
9 |
1
|
rneqi |
|
10 |
3 9
|
eqtri |
|
11 |
10
|
raleqi |
|
12 |
2
|
oveqi |
|
13 |
2
|
oveqi |
|
14 |
12 13
|
eqeq12i |
|
15 |
10 14
|
raleqbii |
|
16 |
15
|
ralbii |
|
17 |
|
fvex |
|
18 |
|
fvex |
|
19 |
|
iscom2 |
|
20 |
17 18 19
|
mp2an |
|
21 |
11 16 20
|
3bitr4ri |
|
22 |
8 21
|
bitrdi |
|
23 |
7 22
|
syl |
|
24 |
23
|
pm5.32i |
|
25 |
4 24
|
bitri |
|