Step |
Hyp |
Ref |
Expression |
1 |
|
neips.1 |
|
2 |
1
|
eltopss |
|
3 |
2
|
adantr |
|
4 |
|
ssid |
|
5 |
|
sseq2 |
|
6 |
|
sseq1 |
|
7 |
5 6
|
anbi12d |
|
8 |
7
|
rspcev |
|
9 |
4 8
|
mpanr2 |
|
10 |
9
|
ad2ant2l |
|
11 |
1
|
isnei |
|
12 |
11
|
ad2ant2r |
|
13 |
3 10 12
|
mpbir2and |
|
14 |
13
|
exp43 |
|
15 |
14
|
3imp |
|
16 |
|
ssnei |
|
17 |
16
|
ex |
|
18 |
17
|
3ad2ant1 |
|
19 |
15 18
|
impbid |
|