Step |
Hyp |
Ref |
Expression |
1 |
|
resubidaddid1lem.a |
|
2 |
|
resubidaddid1lem.b |
|
3 |
|
resubidaddid1lem.c |
|
4 |
|
resubidaddid1lem.1 |
|
5 |
|
rersubcl |
|
6 |
1 2 5
|
syl2anc |
|
7 |
|
rersubcl |
|
8 |
2 3 7
|
syl2anc |
|
9 |
6 8
|
readdcld |
|
10 |
4
|
eqcomd |
|
11 |
2 3 6
|
resubaddd |
|
12 |
10 11
|
mpbid |
|
13 |
12
|
oveq1d |
|
14 |
3
|
recnd |
|
15 |
6
|
recnd |
|
16 |
8
|
recnd |
|
17 |
14 15 16
|
addassd |
|
18 |
1 2 8
|
resubaddd |
|
19 |
4 18
|
mpbid |
|
20 |
13 17 19
|
3eqtr3d |
|
21 |
3 9 20
|
reladdrsub |
|