Step |
Hyp |
Ref |
Expression |
1 |
|
elfvex |
|
2 |
|
isust |
|
3 |
1 2
|
syl |
|
4 |
3
|
ibi |
|
5 |
4
|
simp3d |
|
6 |
|
sseq1 |
|
7 |
6
|
imbi1d |
|
8 |
7
|
ralbidv |
|
9 |
|
ineq1 |
|
10 |
9
|
eleq1d |
|
11 |
10
|
ralbidv |
|
12 |
|
sseq2 |
|
13 |
|
cnveq |
|
14 |
13
|
eleq1d |
|
15 |
|
sseq2 |
|
16 |
15
|
rexbidv |
|
17 |
12 14 16
|
3anbi123d |
|
18 |
8 11 17
|
3anbi123d |
|
19 |
18
|
rspcv |
|
20 |
5 19
|
mpan9 |
|
21 |
20
|
simp2d |
|
22 |
|
ineq2 |
|
23 |
22
|
eleq1d |
|
24 |
23
|
rspcv |
|
25 |
21 24
|
mpan9 |
|
26 |
25
|
3impa |
|