Step |
Hyp |
Ref |
Expression |
1 |
|
shne0.1 |
|
2 |
|
shs00.2 |
|
3 |
|
oveq12 |
|
4 |
|
h0elsh |
|
5 |
4
|
shs0i |
|
6 |
3 5
|
eqtrdi |
|
7 |
1 2
|
shsub1i |
|
8 |
|
sseq2 |
|
9 |
7 8
|
mpbii |
|
10 |
|
shle0 |
|
11 |
1 10
|
ax-mp |
|
12 |
9 11
|
sylib |
|
13 |
2 1
|
shsub2i |
|
14 |
|
sseq2 |
|
15 |
13 14
|
mpbii |
|
16 |
|
shle0 |
|
17 |
2 16
|
ax-mp |
|
18 |
15 17
|
sylib |
|
19 |
12 18
|
jca |
|
20 |
6 19
|
impbii |
|