Step |
Hyp |
Ref |
Expression |
1 |
|
peano2 |
|
2 |
|
df-goal |
|
3 |
|
opex |
|
4 |
2 3
|
eqeltri |
|
5 |
|
isfmlasuc |
|
6 |
1 4 5
|
sylancl |
|
7 |
6
|
adantr |
|
8 |
|
fmlasssuc |
|
9 |
1 8
|
syl |
|
10 |
9
|
sseld |
|
11 |
10
|
com12 |
|
12 |
11
|
imim2i |
|
13 |
12
|
com23 |
|
14 |
13
|
impcom |
|
15 |
|
gonanegoal |
|
16 |
|
eqneqall |
|
17 |
15 16
|
mpi |
|
18 |
17
|
eqcoms |
|
19 |
18
|
a1i |
|
20 |
19
|
rexlimdva |
|
21 |
|
df-goal |
|
22 |
2 21
|
eqeq12i |
|
23 |
|
2oex |
|
24 |
|
opex |
|
25 |
23 24
|
opth |
|
26 |
22 25
|
bitri |
|
27 |
|
vex |
|
28 |
|
vex |
|
29 |
27 28
|
opth |
|
30 |
|
eleq1w |
|
31 |
30
|
eqcoms |
|
32 |
31 11
|
syl6bi |
|
33 |
32
|
impcomd |
|
34 |
29 33
|
simplbiim |
|
35 |
26 34
|
simplbiim |
|
36 |
35
|
com12 |
|
37 |
36
|
adantr |
|
38 |
37
|
rexlimdva |
|
39 |
20 38
|
jaod |
|
40 |
39
|
rexlimdva |
|
41 |
40
|
adantr |
|
42 |
14 41
|
jaod |
|
43 |
7 42
|
sylbid |
|
44 |
43
|
ex |
|