Step |
Hyp |
Ref |
Expression |
1 |
|
fsumlt.1 |
|
2 |
|
fsumlt.2 |
|
3 |
|
fsumlt.3 |
|
4 |
|
fsumlt.4 |
|
5 |
|
fsumlt.5 |
|
6 |
|
difrp |
|
7 |
3 4 6
|
syl2anc |
|
8 |
5 7
|
mpbid |
|
9 |
1 2 8
|
fsumrpcl |
|
10 |
9
|
rpgt0d |
|
11 |
4
|
recnd |
|
12 |
3
|
recnd |
|
13 |
1 11 12
|
fsumsub |
|
14 |
10 13
|
breqtrd |
|
15 |
1 3
|
fsumrecl |
|
16 |
1 4
|
fsumrecl |
|
17 |
15 16
|
posdifd |
|
18 |
14 17
|
mpbird |
|