Step |
Hyp |
Ref |
Expression |
1 |
|
rernegcl |
|
2 |
|
rernegcl |
|
3 |
1 2
|
syl |
|
4 |
|
id |
|
5 |
|
renegid |
|
6 |
|
elre0re |
|
7 |
5 6
|
eqeltrd |
|
8 |
|
readdid1 |
|
9 |
|
repncan3 |
|
10 |
1 6 9
|
syl2anc |
|
11 |
10
|
oveq2d |
|
12 |
|
readdid2 |
|
13 |
8 11 12
|
3eqtr4d |
|
14 |
|
recn |
|
15 |
1
|
recnd |
|
16 |
3
|
recnd |
|
17 |
14 15 16
|
addassd |
|
18 |
5
|
oveq1d |
|
19 |
13 17 18
|
3eqtr4d |
|
20 |
|
readdcan |
|
21 |
20
|
biimpa |
|
22 |
3 4 7 19 21
|
syl31anc |
|