Step |
Hyp |
Ref |
Expression |
1 |
|
sseq1 |
|
2 |
|
fveq2 |
|
3 |
2
|
ineq2d |
|
4 |
3
|
eqeq1d |
|
5 |
1 4
|
anbi12d |
|
6 |
|
eqeq1 |
|
7 |
5 6
|
imbi12d |
|
8 |
|
sseq2 |
|
9 |
|
ineq1 |
|
10 |
9
|
eqeq1d |
|
11 |
8 10
|
anbi12d |
|
12 |
|
eqeq2 |
|
13 |
11 12
|
imbi12d |
|
14 |
|
h0elch |
|
15 |
14
|
elimel |
|
16 |
|
h0elsh |
|
17 |
16
|
elimel |
|
18 |
15 17
|
pjomli |
|
19 |
7 13 18
|
dedth2h |
|
20 |
19
|
imp |
|