Description: Contraposition law for the covers relation. ( cvcon3 analog.) (Contributed by NM, 4-Nov-2011)
Ref | Expression | ||
---|---|---|---|
Hypotheses | cvrcon3b.b | |
|
cvrcon3b.o | |
||
cvrcon3b.c | |
||
Assertion | cvrcon3b | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cvrcon3b.b | |
|
2 | cvrcon3b.o | |
|
3 | cvrcon3b.c | |
|
4 | eqid | |
|
5 | 1 4 2 | opltcon3b | |
6 | simpl1 | |
|
7 | simpl2 | |
|
8 | simpr | |
|
9 | 1 4 2 | opltcon3b | |
10 | 6 7 8 9 | syl3anc | |
11 | simpl3 | |
|
12 | 1 4 2 | opltcon3b | |
13 | 6 8 11 12 | syl3anc | |
14 | 10 13 | anbi12d | |
15 | 1 2 | opoccl | |
16 | 15 | 3ad2antl1 | |
17 | breq2 | |
|
18 | breq1 | |
|
19 | 17 18 | anbi12d | |
20 | 19 | rspcev | |
21 | 20 | ex | |
22 | 16 21 | syl | |
23 | 22 | ancomsd | |
24 | 14 23 | sylbid | |
25 | 24 | rexlimdva | |
26 | simpl1 | |
|
27 | simpl3 | |
|
28 | simpr | |
|
29 | 1 4 2 | opltcon1b | |
30 | 26 27 28 29 | syl3anc | |
31 | simpl2 | |
|
32 | 1 4 2 | opltcon2b | |
33 | 26 28 31 32 | syl3anc | |
34 | 30 33 | anbi12d | |
35 | 1 2 | opoccl | |
36 | 35 | 3ad2antl1 | |
37 | breq2 | |
|
38 | breq1 | |
|
39 | 37 38 | anbi12d | |
40 | 39 | rspcev | |
41 | 40 | ex | |
42 | 36 41 | syl | |
43 | 42 | ancomsd | |
44 | 34 43 | sylbid | |
45 | 44 | rexlimdva | |
46 | 25 45 | impbid | |
47 | 46 | notbid | |
48 | 5 47 | anbi12d | |
49 | 1 4 3 | cvrval | |
50 | simp1 | |
|
51 | 1 2 | opoccl | |
52 | 51 | 3adant2 | |
53 | 1 2 | opoccl | |
54 | 53 | 3adant3 | |
55 | 1 4 3 | cvrval | |
56 | 50 52 54 55 | syl3anc | |
57 | 48 49 56 | 3bitr4d | |