Step |
Hyp |
Ref |
Expression |
1 |
|
bicom1 |
|
2 |
|
nanbi2 |
|
3 |
1 2
|
nanbi12d |
|
4 |
|
nannan |
|
5 |
|
simpr |
|
6 |
5
|
imim2i |
|
7 |
4 6
|
sylbi |
|
8 |
|
nannan |
|
9 |
|
simpr |
|
10 |
9
|
imim2i |
|
11 |
8 10
|
sylbi |
|
12 |
7 11
|
impbid21d |
|
13 |
|
nanan |
|
14 |
|
simpl |
|
15 |
13 14
|
sylbir |
|
16 |
|
nanan |
|
17 |
|
simpl |
|
18 |
16 17
|
sylbir |
|
19 |
|
pm5.1im |
|
20 |
15 18 19
|
syl2imc |
|
21 |
12 20
|
bija |
|
22 |
3 21
|
impbii |
|
23 |
|
nancom |
|
24 |
23
|
nanbi2i |
|
25 |
|
nancom |
|
26 |
24 25
|
bitri |
|
27 |
26
|
bibi1i |
|
28 |
22 27
|
bitri |
|