Step |
Hyp |
Ref |
Expression |
1 |
|
fzennn.1 |
|
2 |
|
eluzel2 |
|
3 |
|
eluzelz |
|
4 |
|
1z |
|
5 |
|
zsubcl |
|
6 |
4 2 5
|
sylancr |
|
7 |
|
fzen |
|
8 |
2 3 6 7
|
syl3anc |
|
9 |
2
|
zcnd |
|
10 |
|
ax-1cn |
|
11 |
|
pncan3 |
|
12 |
9 10 11
|
sylancl |
|
13 |
|
zcn |
|
14 |
|
zcn |
|
15 |
|
addsubass |
|
16 |
10 15
|
mp3an2 |
|
17 |
13 14 16
|
syl2an |
|
18 |
3 2 17
|
syl2anc |
|
19 |
18
|
eqcomd |
|
20 |
12 19
|
oveq12d |
|
21 |
8 20
|
breqtrd |
|
22 |
|
peano2uz |
|
23 |
|
uznn0sub |
|
24 |
1
|
fzennn |
|
25 |
22 23 24
|
3syl |
|
26 |
|
entr |
|
27 |
21 25 26
|
syl2anc |
|