Step |
Hyp |
Ref |
Expression |
1 |
|
prtlem18.1 |
|
2 |
1
|
relopabi |
|
3 |
2
|
a1i |
|
4 |
1
|
prtlem16 |
|
5 |
4
|
a1i |
|
6 |
|
prtlem15 |
|
7 |
1
|
prtlem13 |
|
8 |
1
|
prtlem13 |
|
9 |
7 8
|
anbi12i |
|
10 |
|
reeanv |
|
11 |
9 10
|
bitr4i |
|
12 |
1
|
prtlem13 |
|
13 |
6 11 12
|
3imtr4g |
|
14 |
|
pm3.22 |
|
15 |
14
|
reximi |
|
16 |
1
|
prtlem13 |
|
17 |
15 7 16
|
3imtr4i |
|
18 |
13 17
|
jctil |
|
19 |
18
|
alrimivv |
|
20 |
19
|
alrimiv |
|
21 |
|
dfer2 |
|
22 |
3 5 20 21
|
syl3anbrc |
|