Step |
Hyp |
Ref |
Expression |
1 |
|
ixx.1 |
|
2 |
|
ixxss2.2 |
|
3 |
|
ixxss2.3 |
|
4 |
2
|
elixx3g |
|
5 |
4
|
simplbi |
|
6 |
5
|
adantl |
|
7 |
6
|
simp3d |
|
8 |
4
|
simprbi |
|
9 |
8
|
adantl |
|
10 |
9
|
simpld |
|
11 |
9
|
simprd |
|
12 |
|
simplr |
|
13 |
6
|
simp2d |
|
14 |
|
simpll |
|
15 |
7 13 14 3
|
syl3anc |
|
16 |
11 12 15
|
mp2and |
|
17 |
6
|
simp1d |
|
18 |
1
|
elixx1 |
|
19 |
17 14 18
|
syl2anc |
|
20 |
7 10 16 19
|
mpbir3and |
|
21 |
20
|
ex |
|
22 |
21
|
ssrdv |
|