Step |
Hyp |
Ref |
Expression |
1 |
|
ecxrn |
|
2 |
|
ecxrn |
|
3 |
1 2
|
ineqan12d |
|
4 |
|
inopab |
|
5 |
3 4
|
eqtrdi |
|
6 |
|
an4 |
|
7 |
6
|
opabbii |
|
8 |
5 7
|
eqtrdi |
|
9 |
8
|
neeq1d |
|
10 |
|
opabn0 |
|
11 |
9 10
|
bitrdi |
|
12 |
|
exdistrv |
|
13 |
11 12
|
bitrdi |
|
14 |
|
ecinn0 |
|
15 |
|
ecinn0 |
|
16 |
14 15
|
anbi12d |
|
17 |
13 16
|
bitr4d |
|
18 |
|
neanior |
|
19 |
17 18
|
bitrdi |
|
20 |
19
|
necon4abid |
|