Step |
Hyp |
Ref |
Expression |
1 |
|
ntrnei.o |
|
2 |
|
ntrnei.f |
|
3 |
|
ntrnei.r |
|
4 |
|
simpr |
|
5 |
|
elpwi |
|
6 |
5
|
sselda |
|
7 |
|
biimt |
|
8 |
6 7
|
syl |
|
9 |
8
|
pm5.74da |
|
10 |
|
bi2.04 |
|
11 |
9 10
|
syl6bb |
|
12 |
11
|
albidv |
|
13 |
|
dfss2 |
|
14 |
|
df-ral |
|
15 |
12 13 14
|
3bitr4g |
|
16 |
4 15
|
syl |
|
17 |
3
|
ad2antrr |
|
18 |
|
simpr |
|
19 |
|
simplr |
|
20 |
1 2 17 18 19
|
ntrneiel |
|
21 |
20
|
imbi2d |
|
22 |
21
|
ralbidva |
|
23 |
16 22
|
bitrd |
|
24 |
23
|
ralbidva |
|
25 |
|
ralcom |
|
26 |
24 25
|
syl6bb |
|