| Step |
Hyp |
Ref |
Expression |
| 1 |
|
iblcn.1 |
|
| 2 |
1
|
ismbfcn2 |
|
| 3 |
2
|
anbi1d |
|
| 4 |
|
3anass |
|
| 5 |
|
an4 |
|
| 6 |
3 4 5
|
3bitr4g |
|
| 7 |
|
eqid |
|
| 8 |
|
eqid |
|
| 9 |
|
eqid |
|
| 10 |
|
eqid |
|
| 11 |
7 8 9 10 1
|
iblcnlem1 |
|
| 12 |
1
|
recld |
|
| 13 |
12
|
iblrelem |
|
| 14 |
|
3anass |
|
| 15 |
13 14
|
bitrdi |
|
| 16 |
1
|
imcld |
|
| 17 |
16
|
iblrelem |
|
| 18 |
|
3anass |
|
| 19 |
17 18
|
bitrdi |
|
| 20 |
15 19
|
anbi12d |
|
| 21 |
6 11 20
|
3bitr4d |
|