Step |
Hyp |
Ref |
Expression |
1 |
|
eupths.i |
|
2 |
|
upgriseupth.v |
|
3 |
1
|
iseupthf1o |
|
4 |
3
|
a1i |
|
5 |
2 1
|
upgriswlk |
|
6 |
5
|
anbi1d |
|
7 |
|
simpr |
|
8 |
|
simpl2 |
|
9 |
|
simpl3 |
|
10 |
7 8 9
|
3jca |
|
11 |
|
f1of |
|
12 |
|
iswrdi |
|
13 |
11 12
|
syl |
|
14 |
13
|
3anim1i |
|
15 |
|
simp1 |
|
16 |
14 15
|
jca |
|
17 |
10 16
|
impbii |
|
18 |
17
|
a1i |
|
19 |
4 6 18
|
3bitrd |
|