Step |
Hyp |
Ref |
Expression |
1 |
|
ply1term.1 |
|
2 |
|
ssel2 |
|
3 |
1
|
ply1termlem |
|
4 |
2 3
|
stoic3 |
|
5 |
|
simp1 |
|
6 |
|
0cnd |
|
7 |
6
|
snssd |
|
8 |
5 7
|
unssd |
|
9 |
|
simp3 |
|
10 |
|
simpl2 |
|
11 |
|
elun1 |
|
12 |
10 11
|
syl |
|
13 |
|
ssun2 |
|
14 |
|
c0ex |
|
15 |
14
|
snss |
|
16 |
13 15
|
mpbir |
|
17 |
|
ifcl |
|
18 |
12 16 17
|
sylancl |
|
19 |
8 9 18
|
elplyd |
|
20 |
4 19
|
eqeltrd |
|
21 |
|
plyun0 |
|
22 |
20 21
|
eleqtrdi |
|