Step |
Hyp |
Ref |
Expression |
1 |
|
odsubdvds.1 |
|
2 |
|
eqid |
|
3 |
2
|
subggrp |
|
4 |
3
|
3ad2ant1 |
|
5 |
2
|
subgbas |
|
6 |
5
|
3ad2ant1 |
|
7 |
|
simp2 |
|
8 |
6 7
|
eqeltrrd |
|
9 |
|
simp3 |
|
10 |
9 6
|
eleqtrd |
|
11 |
|
eqid |
|
12 |
|
eqid |
|
13 |
11 12
|
oddvds2 |
|
14 |
4 8 10 13
|
syl3anc |
|
15 |
2 1 12
|
subgod |
|
16 |
15
|
3adant2 |
|
17 |
6
|
fveq2d |
|
18 |
14 16 17
|
3brtr4d |
|