Step |
Hyp |
Ref |
Expression |
1 |
|
difeq2 |
|
2 |
1
|
eleq1d |
|
3 |
2
|
elrab |
|
4 |
|
difeq2 |
|
5 |
4
|
eleq1d |
|
6 |
5
|
elrab |
|
7 |
|
an4 |
|
8 |
7
|
biimpi |
|
9 |
3 6 8
|
syl2anb |
|
10 |
|
sorpssi |
|
11 |
10
|
expcom |
|
12 |
|
velpw |
|
13 |
|
dfss4 |
|
14 |
12 13
|
bitri |
|
15 |
|
velpw |
|
16 |
|
dfss4 |
|
17 |
15 16
|
bitri |
|
18 |
|
sscon |
|
19 |
|
sseq12 |
|
20 |
18 19
|
syl5ib |
|
21 |
|
sscon |
|
22 |
|
sseq12 |
|
23 |
22
|
ancoms |
|
24 |
21 23
|
syl5ib |
|
25 |
20 24
|
orim12d |
|
26 |
14 17 25
|
syl2anb |
|
27 |
26
|
com12 |
|
28 |
27
|
orcoms |
|
29 |
11 28
|
syl6 |
|
30 |
29
|
com3l |
|
31 |
30
|
impd |
|
32 |
9 31
|
syl5 |
|
33 |
32
|
ralrimivv |
|
34 |
|
sorpss |
|
35 |
33 34
|
sylibr |
|