| Step |
Hyp |
Ref |
Expression |
| 1 |
|
istrkg.p |
|
| 2 |
|
istrkg.d |
|
| 3 |
|
istrkg.i |
|
| 4 |
|
simpl |
|
| 5 |
4
|
difeq1d |
|
| 6 |
|
simpr |
|
| 7 |
6
|
oveqd |
|
| 8 |
7
|
eleq2d |
|
| 9 |
6
|
oveqd |
|
| 10 |
9
|
eleq2d |
|
| 11 |
6
|
oveqd |
|
| 12 |
11
|
eleq2d |
|
| 13 |
8 10 12
|
3orbi123d |
|
| 14 |
4 13
|
rabeqbidv |
|
| 15 |
4 5 14
|
mpoeq123dv |
|
| 16 |
15
|
eqeq2d |
|
| 17 |
1 3 16
|
sbcie2s |
|
| 18 |
|
fveqeq2 |
|
| 19 |
17 18
|
bitrd |
|
| 20 |
|
eqid |
|
| 21 |
19 20
|
elab4g |
|