Step |
Hyp |
Ref |
Expression |
1 |
|
ntrnei.o |
|
2 |
|
ntrnei.f |
|
3 |
|
ntrnei.r |
|
4 |
1 2 3
|
ntrneiiex |
|
5 |
|
elmapi |
|
6 |
4 5
|
syl |
|
7 |
6
|
ffvelrnda |
|
8 |
7
|
elpwid |
|
9 |
8
|
sselda |
|
10 |
|
biimt |
|
11 |
9 10
|
syl |
|
12 |
11
|
pm5.74da |
|
13 |
|
bi2.04 |
|
14 |
12 13
|
syl6bb |
|
15 |
14
|
albidv |
|
16 |
|
dfss2 |
|
17 |
|
df-ral |
|
18 |
15 16 17
|
3bitr4g |
|
19 |
3
|
ad2antrr |
|
20 |
|
simpr |
|
21 |
|
simplr |
|
22 |
1 2 19 20 21
|
ntrneiel |
|
23 |
22
|
imbi1d |
|
24 |
23
|
ralbidva |
|
25 |
18 24
|
bitrd |
|
26 |
25
|
ralbidva |
|
27 |
|
ralcom |
|
28 |
26 27
|
syl6bb |
|