Step |
Hyp |
Ref |
Expression |
1 |
|
supgtoreq.1 |
|
2 |
|
supgtoreq.2 |
|
3 |
|
supgtoreq.3 |
|
4 |
|
supgtoreq.4 |
|
5 |
|
supgtoreq.5 |
|
6 |
4
|
ne0d |
|
7 |
|
fisup2g |
|
8 |
1 3 6 2 7
|
syl13anc |
|
9 |
|
ssrexv |
|
10 |
2 8 9
|
sylc |
|
11 |
1 10
|
supub |
|
12 |
4 11
|
mpd |
|
13 |
5 12
|
eqnbrtrd |
|
14 |
|
fisupcl |
|
15 |
1 3 6 2 14
|
syl13anc |
|
16 |
2 15
|
sseldd |
|
17 |
5 16
|
eqeltrd |
|
18 |
2 4
|
sseldd |
|
19 |
|
sotric |
|
20 |
1 17 18 19
|
syl12anc |
|
21 |
|
orcom |
|
22 |
|
eqcom |
|
23 |
22
|
orbi2i |
|
24 |
21 23
|
bitri |
|
25 |
24
|
notbii |
|
26 |
20 25
|
bitr2di |
|
27 |
13 26
|
mtbird |
|
28 |
27
|
notnotrd |
|