Step |
Hyp |
Ref |
Expression |
1 |
|
dfgrp2.b |
|
2 |
|
dfgrp2.p |
|
3 |
1 2
|
dfgrp2 |
|
4 |
|
ax-1 |
|
5 |
|
fvprc |
|
6 |
1
|
eleq2i |
|
7 |
|
eleq2 |
|
8 |
|
noel |
|
9 |
8
|
pm2.21i |
|
10 |
7 9
|
biimtrdi |
|
11 |
6 10
|
biimtrid |
|
12 |
5 11
|
syl |
|
13 |
4 12
|
pm2.61i |
|
14 |
13
|
a1d |
|
15 |
14
|
rexlimiv |
|
16 |
1 2
|
issgrpv |
|
17 |
15 16
|
syl |
|
18 |
17
|
pm5.32ri |
|
19 |
3 18
|
bitri |
|