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 |
1 2 3
|
ntrneibex |
|
8 |
|
pwidg |
|
9 |
7 8
|
syl |
|
10 |
6 9
|
ffvelrnd |
|
11 |
10
|
elpwid |
|
12 |
|
eqss |
|
13 |
|
dfss3 |
|
14 |
13
|
anbi2i |
|
15 |
12 14
|
bitri |
|
16 |
15
|
a1i |
|
17 |
11 16
|
mpbirand |
|
18 |
3
|
adantr |
|
19 |
|
simpr |
|
20 |
9
|
adantr |
|
21 |
1 2 18 19 20
|
ntrneiel |
|
22 |
21
|
ralbidva |
|
23 |
17 22
|
bitrd |
|