Step |
Hyp |
Ref |
Expression |
1 |
|
idlval.1 |
|
2 |
|
idlval.2 |
|
3 |
|
idlval.3 |
|
4 |
|
idlval.4 |
|
5 |
1 2 3 4
|
idlval |
|
6 |
5
|
eleq2d |
|
7 |
1
|
fvexi |
|
8 |
7
|
rnex |
|
9 |
3 8
|
eqeltri |
|
10 |
9
|
elpw2 |
|
11 |
10
|
anbi1i |
|
12 |
|
eleq2 |
|
13 |
|
eleq2 |
|
14 |
13
|
raleqbi1dv |
|
15 |
|
eleq2 |
|
16 |
|
eleq2 |
|
17 |
15 16
|
anbi12d |
|
18 |
17
|
ralbidv |
|
19 |
14 18
|
anbi12d |
|
20 |
19
|
raleqbi1dv |
|
21 |
12 20
|
anbi12d |
|
22 |
21
|
elrab |
|
23 |
|
3anass |
|
24 |
11 22 23
|
3bitr4i |
|
25 |
6 24
|
bitrdi |
|