Step |
Hyp |
Ref |
Expression |
1 |
|
iccsuble.1 |
|
2 |
|
iccsuble.2 |
|
3 |
|
iccsuble.3 |
|
4 |
|
iccsuble.4 |
|
5 |
|
eliccre |
|
6 |
1 2 3 5
|
syl3anc |
|
7 |
|
eliccre |
|
8 |
1 2 4 7
|
syl3anc |
|
9 |
|
elicc2 |
|
10 |
1 2 9
|
syl2anc |
|
11 |
3 10
|
mpbid |
|
12 |
11
|
simp3d |
|
13 |
|
elicc2 |
|
14 |
1 2 13
|
syl2anc |
|
15 |
4 14
|
mpbid |
|
16 |
15
|
simp2d |
|
17 |
6 1 2 8 12 16
|
le2subd |
|