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 |
|