Step |
Hyp |
Ref |
Expression |
1 |
|
sqrtcval |
|
2 |
|
ovif2 |
|
3 |
|
neg1cn |
|
4 |
|
ax-icn |
|
5 |
4
|
mulm1i |
|
6 |
3 4 5
|
mulcomli |
|
7 |
4
|
mulid1i |
|
8 |
|
ifeq12 |
|
9 |
6 7 8
|
mp2an |
|
10 |
2 9
|
eqtr2i |
|
11 |
10
|
a1i |
|
12 |
11
|
oveq1d |
|
13 |
4
|
a1i |
|
14 |
|
neg1rr |
|
15 |
|
1re |
|
16 |
14 15
|
ifcli |
|
17 |
16
|
a1i |
|
18 |
17
|
recnd |
|
19 |
|
sqrtcvallem3 |
|
20 |
19
|
recnd |
|
21 |
13 18 20
|
mulassd |
|
22 |
12 21
|
eqtrd |
|
23 |
22
|
oveq2d |
|
24 |
1 23
|
eqtr4d |
|