Step |
Hyp |
Ref |
Expression |
1 |
|
nmf.x |
|
2 |
|
nmf.n |
|
3 |
|
nmmtri.m |
|
4 |
1 2
|
nmcl |
|
5 |
4
|
3adant3 |
|
6 |
1 2
|
nmcl |
|
7 |
6
|
3adant2 |
|
8 |
5 7
|
resubcld |
|
9 |
8
|
recnd |
|
10 |
9
|
abscld |
|
11 |
|
simp1 |
|
12 |
|
ngpgrp |
|
13 |
1 3
|
grpsubcl |
|
14 |
12 13
|
syl3an1 |
|
15 |
1 2
|
nmcl |
|
16 |
11 14 15
|
syl2anc |
|
17 |
8
|
leabsd |
|
18 |
1 2 3
|
nmrtri |
|
19 |
8 10 16 17 18
|
letrd |
|