Step |
Hyp |
Ref |
Expression |
1 |
|
binom2.1 |
|
2 |
|
binom2.2 |
|
3 |
1 2
|
subsqi |
|
4 |
3
|
eqeq1i |
|
5 |
1
|
sqcli |
|
6 |
2
|
sqcli |
|
7 |
5 6
|
subeq0i |
|
8 |
1 2
|
addcli |
|
9 |
1 2
|
subcli |
|
10 |
8 9
|
mul0ori |
|
11 |
4 7 10
|
3bitr3i |
|
12 |
|
orcom |
|
13 |
1 2
|
subeq0i |
|
14 |
1 2
|
subnegi |
|
15 |
14
|
eqeq1i |
|
16 |
2
|
negcli |
|
17 |
1 16
|
subeq0i |
|
18 |
15 17
|
bitr3i |
|
19 |
13 18
|
orbi12i |
|
20 |
11 12 19
|
3bitri |
|