Step |
Hyp |
Ref |
Expression |
1 |
|
recbothd.1 |
|
2 |
|
recbothd.2 |
|
3 |
|
recbothd.3 |
|
4 |
|
recbothd.4 |
|
5 |
|
recbothd.5 |
|
6 |
|
recbothd.6 |
|
7 |
|
recbothd.7 |
|
8 |
|
recbothd.8 |
|
9 |
1 3 4
|
divcld |
|
10 |
1 3 2 4
|
divne0d |
|
11 |
9 10
|
jca |
|
12 |
5 7 8
|
divcld |
|
13 |
5 7 6 8
|
divne0d |
|
14 |
12 13
|
jca |
|
15 |
11 14
|
jca |
|
16 |
|
rec11 |
|
17 |
15 16
|
syl |
|
18 |
17
|
bicomd |
|
19 |
1 3 2 4
|
recdivd |
|
20 |
5 7 6 8
|
recdivd |
|
21 |
19 20
|
eqeq12d |
|
22 |
18 21
|
bitrd |
|