Step |
Hyp |
Ref |
Expression |
1 |
|
sumdmdi.1 |
|
2 |
|
sumdmdi.2 |
|
3 |
|
dmdbr3 |
|
4 |
1 2 3
|
mp2an |
|
5 |
|
chabs2 |
|
6 |
2 5
|
mpan2 |
|
7 |
6
|
ineq2d |
|
8 |
|
incom |
|
9 |
|
inass |
|
10 |
|
incom |
|
11 |
8 9 10
|
3eqtri |
|
12 |
7 11
|
eqtr3di |
|
13 |
12
|
adantr |
|
14 |
|
ineq1 |
|
15 |
14
|
adantl |
|
16 |
13 15
|
eqtr4d |
|
17 |
16
|
ralimiaa |
|
18 |
4 17
|
sylbi |
|
19 |
|
atelch |
|
20 |
19
|
imim1i |
|
21 |
20
|
ralimi2 |
|
22 |
18 21
|
syl |
|
23 |
|
inss1 |
|
24 |
|
sseq1 |
|
25 |
23 24
|
mpbiri |
|
26 |
|
incom |
|
27 |
|
df-ss |
|
28 |
27
|
biimpi |
|
29 |
26 28
|
syl5eq |
|
30 |
29
|
sseq1d |
|
31 |
25 30
|
syl5ibcom |
|
32 |
31
|
ralimi |
|
33 |
1 2
|
dmdbr5ati |
|
34 |
32 33
|
sylibr |
|
35 |
22 34
|
impbii |
|