Step |
Hyp |
Ref |
Expression |
1 |
|
abscl |
|
2 |
|
recl |
|
3 |
1 2
|
readdcld |
|
4 |
|
2rp |
|
5 |
4
|
a1i |
|
6 |
|
negcl |
|
7 |
6
|
releabsd |
|
8 |
6
|
abscld |
|
9 |
6
|
recld |
|
10 |
8 9
|
subge0d |
|
11 |
7 10
|
mpbird |
|
12 |
|
absneg |
|
13 |
|
reneg |
|
14 |
12 13
|
oveq12d |
|
15 |
1
|
recnd |
|
16 |
2
|
recnd |
|
17 |
15 16
|
subnegd |
|
18 |
14 17
|
eqtrd |
|
19 |
11 18
|
breqtrd |
|
20 |
3 5 19
|
divge0d |
|