Step |
Hyp |
Ref |
Expression |
1 |
|
dstrvprob.1 |
|
2 |
|
dstrvprob.2 |
|
3 |
|
orvcelel.1 |
|
4 |
1 2 3
|
orrvcval4 |
|
5 |
|
epelg |
|
6 |
3 5
|
syl |
|
7 |
6
|
rabbidv |
|
8 |
|
dfin5 |
|
9 |
8
|
a1i |
|
10 |
|
elssuni |
|
11 |
|
unibrsiga |
|
12 |
10 11
|
sseqtrdi |
|
13 |
3 12
|
syl |
|
14 |
|
sseqin2 |
|
15 |
13 14
|
sylib |
|
16 |
7 9 15
|
3eqtr2d |
|
17 |
16
|
imaeq2d |
|
18 |
4 17
|
eqtrd |
|