Step |
Hyp |
Ref |
Expression |
1 |
|
lsw |
|
2 |
1
|
3ad2ant1 |
|
3 |
|
wrdf |
|
4 |
|
lencl |
|
5 |
|
simpll |
|
6 |
|
elnnne0 |
|
7 |
6
|
biimpri |
|
8 |
|
nnm1nn0 |
|
9 |
7 8
|
syl |
|
10 |
|
nn0re |
|
11 |
10
|
ltm1d |
|
12 |
11
|
adantr |
|
13 |
|
elfzo0 |
|
14 |
9 7 12 13
|
syl3anbrc |
|
15 |
14
|
adantll |
|
16 |
5 15
|
ffvelrnd |
|
17 |
16
|
ex |
|
18 |
3 4 17
|
syl2anc |
|
19 |
|
eleq1a |
|
20 |
19
|
com12 |
|
21 |
20
|
eqcoms |
|
22 |
21
|
com12 |
|
23 |
|
nnel |
|
24 |
22 23
|
syl6ibr |
|
25 |
24
|
necon2ad |
|
26 |
18 25
|
syl6 |
|
27 |
26
|
com23 |
|
28 |
27
|
3imp |
|
29 |
2 28
|
eqnetrd |
|