Step |
Hyp |
Ref |
Expression |
1 |
|
elsng |
|
2 |
|
bj-xpima2sn |
|
3 |
1 2
|
syl6bir |
|
4 |
3
|
imp |
|
5 |
4
|
eleq2d |
|
6 |
5
|
abbidv |
|
7 |
|
df-bj-proj |
|
8 |
|
bj-taginv |
|
9 |
6 7 8
|
3eqtr4g |
|
10 |
9
|
ex |
|
11 |
|
noel |
|
12 |
7
|
abeq2i |
|
13 |
|
elsni |
|
14 |
|
bj-xpima1sn |
|
15 |
13 14
|
nsyl5 |
|
16 |
15
|
eleq2d |
|
17 |
12 16
|
syl5bb |
|
18 |
11 17
|
mtbiri |
|
19 |
18
|
eq0rdv |
|
20 |
|
ifval |
|
21 |
10 19 20
|
sylanblrc |
|
22 |
|
eqcom |
|
23 |
|
ifbi |
|
24 |
22 23
|
ax-mp |
|
25 |
21 24
|
eqtrdi |
|