Step |
Hyp |
Ref |
Expression |
1 |
|
zcn |
|
2 |
1
|
adantl |
|
3 |
2
|
2timesd |
|
4 |
3
|
oveq2d |
|
5 |
|
rmyadd |
|
6 |
5
|
3anidm23 |
|
7 |
|
2cnd |
|
8 |
|
frmx |
|
9 |
8
|
fovcl |
|
10 |
9
|
nn0cnd |
|
11 |
|
frmy |
|
12 |
11
|
fovcl |
|
13 |
12
|
zcnd |
|
14 |
7 10 13
|
mulassd |
|
15 |
10 13
|
mulcld |
|
16 |
15
|
2timesd |
|
17 |
10 13
|
mulcomd |
|
18 |
17
|
oveq1d |
|
19 |
14 16 18
|
3eqtrrd |
|
20 |
4 6 19
|
3eqtrd |
|