Step |
Hyp |
Ref |
Expression |
1 |
|
simpll |
|
2 |
|
simprl |
|
3 |
|
simplr |
|
4 |
|
xleadd1a |
|
5 |
4
|
ex |
|
6 |
1 2 3 5
|
syl3anc |
|
7 |
|
simprr |
|
8 |
|
xleadd2a |
|
9 |
8
|
ex |
|
10 |
3 7 2 9
|
syl3anc |
|
11 |
|
xaddcl |
|
12 |
11
|
adantr |
|
13 |
|
xaddcl |
|
14 |
2 3 13
|
syl2anc |
|
15 |
|
xaddcl |
|
16 |
15
|
adantl |
|
17 |
|
xrletr |
|
18 |
12 14 16 17
|
syl3anc |
|
19 |
6 10 18
|
syl2and |
|