Step |
Hyp |
Ref |
Expression |
1 |
|
brdomi |
|
2 |
|
peano1 |
|
3 |
|
f1f1orn |
|
4 |
3
|
adantr |
|
5 |
|
f1f |
|
6 |
5
|
frnd |
|
7 |
|
sseq0 |
|
8 |
6 7
|
sylan |
|
9 |
8
|
f1oeq3d |
|
10 |
4 9
|
mpbid |
|
11 |
|
f1ocnv |
|
12 |
|
noel |
|
13 |
|
f1o00 |
|
14 |
13
|
simprbi |
|
15 |
14
|
eleq2d |
|
16 |
12 15
|
mtbiri |
|
17 |
10 11 16
|
3syl |
|
18 |
2 17
|
mt2 |
|
19 |
18
|
imnani |
|
20 |
19
|
neqned |
|
21 |
20
|
exlimiv |
|
22 |
1 21
|
syl |
|