Step |
Hyp |
Ref |
Expression |
1 |
|
isnumbasgrplem1.b |
|
2 |
|
ensymb |
|
3 |
|
bren |
|
4 |
2 3
|
bitri |
|
5 |
|
eqidd |
|
6 |
1
|
a1i |
|
7 |
|
f1ofo |
|
8 |
7
|
adantr |
|
9 |
|
simpr |
|
10 |
5 6 8 9
|
imasbas |
|
11 |
|
simpl |
|
12 |
|
ablgrp |
|
13 |
12
|
adantl |
|
14 |
5 6 11 13
|
imasgim |
|
15 |
|
brgici |
|
16 |
|
gicabl |
|
17 |
14 15 16
|
3syl |
|
18 |
9 17
|
mpbid |
|
19 |
|
basfn |
|
20 |
|
ssv |
|
21 |
|
fnfvima |
|
22 |
19 20 21
|
mp3an12 |
|
23 |
18 22
|
syl |
|
24 |
10 23
|
eqeltrd |
|
25 |
24
|
ex |
|
26 |
25
|
exlimiv |
|
27 |
26
|
impcom |
|
28 |
4 27
|
sylan2b |
|