Step |
Hyp |
Ref |
Expression |
1 |
|
fvex |
|
2 |
|
eltg3 |
|
3 |
1 2
|
ax-mp |
|
4 |
|
uniiun |
|
5 |
|
simpr |
|
6 |
5
|
sselda |
|
7 |
|
eltg4i |
|
8 |
6 7
|
syl |
|
9 |
8
|
iuneq2dv |
|
10 |
4 9
|
syl5eq |
|
11 |
|
iuncom4 |
|
12 |
10 11
|
eqtrdi |
|
13 |
|
inss1 |
|
14 |
13
|
rgenw |
|
15 |
|
iunss |
|
16 |
14 15
|
mpbir |
|
17 |
16
|
a1i |
|
18 |
|
eltg3i |
|
19 |
17 18
|
sylan2 |
|
20 |
12 19
|
eqeltrd |
|
21 |
|
eleq1 |
|
22 |
20 21
|
syl5ibrcom |
|
23 |
22
|
expimpd |
|
24 |
23
|
exlimdv |
|
25 |
3 24
|
syl5bi |
|
26 |
25
|
ssrdv |
|
27 |
|
bastg |
|
28 |
|
tgss |
|
29 |
1 27 28
|
sylancr |
|
30 |
26 29
|
eqssd |
|