Step |
Hyp |
Ref |
Expression |
1 |
|
atansopn.d |
|
2 |
|
atansopn.s |
|
3 |
|
ax-resscn |
|
4 |
|
1re |
|
5 |
|
resqcl |
|
6 |
|
readdcl |
|
7 |
4 5 6
|
sylancr |
|
8 |
7
|
recnd |
|
9 |
4
|
a1i |
|
10 |
|
0lt1 |
|
11 |
10
|
a1i |
|
12 |
|
sqge0 |
|
13 |
9 5 11 12
|
addgtge0d |
|
14 |
|
0re |
|
15 |
|
ltnle |
|
16 |
14 7 15
|
sylancr |
|
17 |
13 16
|
mpbid |
|
18 |
|
mnfxr |
|
19 |
|
elioc2 |
|
20 |
18 14 19
|
mp2an |
|
21 |
20
|
simp3bi |
|
22 |
17 21
|
nsyl |
|
23 |
8 22
|
eldifd |
|
24 |
23 1
|
eleqtrrdi |
|
25 |
24
|
rgen |
|
26 |
|
ssrab |
|
27 |
3 25 26
|
mpbir2an |
|
28 |
27 2
|
sseqtrri |
|