Step |
Hyp |
Ref |
Expression |
1 |
|
qustrivr.1 |
|
2 |
|
qustrivr.2 |
|
3 |
2
|
a1i |
|
4 |
1
|
a1i |
|
5 |
|
ovexd |
|
6 |
|
simpl |
|
7 |
3 4 5 6
|
qusbas |
|
8 |
7
|
3adant3 |
|
9 |
|
simp3 |
|
10 |
8 9
|
eqtrd |
|
11 |
10
|
unieqd |
|
12 |
|
eqid |
|
13 |
1 12
|
eqger |
|
14 |
13
|
adantl |
|
15 |
14 5
|
uniqs2 |
|
16 |
15
|
3adant3 |
|
17 |
|
unisng |
|
18 |
17
|
3ad2ant2 |
|
19 |
11 16 18
|
3eqtr3rd |
|