Step |
Hyp |
Ref |
Expression |
1 |
|
fsumshftd.1 |
|
2 |
|
fsumshftd.2 |
|
3 |
|
fsumshftd.3 |
|
4 |
|
fsumshftd.4 |
|
5 |
|
fsumshftd.5 |
|
6 |
|
nfcv |
|
7 |
|
nfcsb1v |
|
8 |
|
csbeq1a |
|
9 |
6 7 8
|
cbvsumi |
|
10 |
|
nfv |
|
11 |
7
|
nfel1 |
|
12 |
10 11
|
nfim |
|
13 |
|
eleq1w |
|
14 |
13
|
anbi2d |
|
15 |
8
|
eleq1d |
|
16 |
14 15
|
imbi12d |
|
17 |
12 16 4
|
chvarfv |
|
18 |
|
csbeq1 |
|
19 |
1 2 3 17 18
|
fsumshft |
|
20 |
|
ovexd |
|
21 |
20 5
|
csbied |
|
22 |
21
|
sumeq2sdv |
|
23 |
19 22
|
eqtrd |
|
24 |
9 23
|
eqtrid |
|