Step |
Hyp |
Ref |
Expression |
1 |
|
0red |
|
2 |
|
1re |
|
3 |
|
rersubcl |
|
4 |
2 2 3
|
mp2an |
|
5 |
4
|
a1i |
|
6 |
|
ax-icn |
|
7 |
6 6
|
mulcli |
|
8 |
|
ax-1cn |
|
9 |
4
|
recni |
|
10 |
7 8 9
|
addassi |
|
11 |
|
repncan3 |
|
12 |
2 2 11
|
mp2an |
|
13 |
12
|
oveq2i |
|
14 |
10 13
|
eqtri |
|
15 |
|
ax-i2m1 |
|
16 |
15
|
oveq1i |
|
17 |
14 16 15
|
3eqtr3i |
|
18 |
17
|
a1i |
|
19 |
1 5 18
|
reladdrsub |
|
20 |
19
|
mptru |
|