Step |
Hyp |
Ref |
Expression |
1 |
|
ehleudis.i |
|
2 |
|
ehleudis.e |
|
3 |
|
ehleudis.x |
|
4 |
|
ehleudis.d |
|
5 |
2
|
ehlval |
|
6 |
5
|
fveq2d |
|
7 |
4 6
|
eqtrid |
|
8 |
7
|
oveqd |
|
9 |
8
|
3ad2ant1 |
|
10 |
|
fzfi |
|
11 |
1 10
|
eqeltri |
|
12 |
3
|
eleq2i |
|
13 |
12
|
biimpi |
|
14 |
13
|
3ad2ant2 |
|
15 |
3
|
eleq2i |
|
16 |
15
|
biimpi |
|
17 |
16
|
3ad2ant3 |
|
18 |
|
eqid |
|
19 |
1
|
eqcomi |
|
20 |
19
|
fveq2i |
|
21 |
20
|
fveq2i |
|
22 |
18 21
|
rrxdsfival |
|
23 |
11 14 17 22
|
mp3an2i |
|
24 |
9 23
|
eqtrd |
|