Description: There exists an atom under a co-atom different from any given element. (Contributed by NM, 24-Jul-2013)
Ref | Expression | ||
---|---|---|---|
Hypotheses | lhpex1.l | |
|
lhpex1.a | |
||
lhpex1.h | |
||
Assertion | lhpexle1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lhpex1.l | |
|
2 | lhpex1.a | |
|
3 | lhpex1.h | |
|
4 | 1 2 3 | lhpexle | |
5 | tru | |
|
6 | 5 | jctr | |
7 | 6 | reximi | |
8 | 4 7 | syl | |
9 | simpll | |
|
10 | simprl | |
|
11 | eqid | |
|
12 | 11 3 | lhpbase | |
13 | 12 | ad2antlr | |
14 | eqid | |
|
15 | 1 14 2 3 | lhplt | |
16 | 11 14 2 | 2atlt | |
17 | 9 10 13 15 16 | syl31anc | |
18 | simp3r | |
|
19 | simp1ll | |
|
20 | simp2 | |
|
21 | simp1lr | |
|
22 | 1 14 | pltle | |
23 | 19 20 21 22 | syl3anc | |
24 | 18 23 | mpd | |
25 | trud | |
|
26 | simp3l | |
|
27 | 24 25 26 | 3jca | |
28 | 27 | 3expia | |
29 | 28 | reximdva | |
30 | 17 29 | mpd | |
31 | 8 30 | lhpexle1lem | |
32 | 3simpb | |
|
33 | 32 | reximi | |
34 | 31 33 | syl | |