Step |
Hyp |
Ref |
Expression |
1 |
|
binomfallfaclem.1 |
|
2 |
|
binomfallfaclem.2 |
|
3 |
|
binomfallfaclem.3 |
|
4 |
|
elfzelz |
|
5 |
|
bccl |
|
6 |
3 4 5
|
syl2an |
|
7 |
6
|
nn0cnd |
|
8 |
|
fznn0sub |
|
9 |
|
fallfaccl |
|
10 |
1 8 9
|
syl2an |
|
11 |
|
elfznn0 |
|
12 |
|
peano2nn0 |
|
13 |
11 12
|
syl |
|
14 |
|
fallfaccl |
|
15 |
2 13 14
|
syl2an |
|
16 |
10 15
|
mulcld |
|
17 |
7 16
|
mulcld |
|