Description: Transitivity law for outsideness. Theorem 6.7 of Schwabhauser p. 44. (Contributed by Scott Fenton, 18-Oct-2013) (Revised by Mario Carneiro, 19-Apr-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | outsideoftr | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpll | |
|
2 | simplr | |
|
3 | simprr | |
|
4 | 1 2 3 | 3jca | |
5 | simplr1 | |
|
6 | simplr3 | |
|
7 | df-3an | |
|
8 | simp1 | |
|
9 | simp3r | |
|
10 | simp2l | |
|
11 | simp2r | |
|
12 | simp3l | |
|
13 | simpr2 | |
|
14 | simpr3 | |
|
15 | 8 9 10 11 12 13 14 | btwnexchand | |
16 | 15 | orcd | |
17 | 7 16 | sylan2br | |
18 | 17 | expr | |
19 | simprlr | |
|
20 | simprr | |
|
21 | btwnconn3 | |
|
22 | 8 9 10 12 11 21 | syl122anc | |
23 | 22 | adantr | |
24 | 19 20 23 | mp2and | |
25 | 24 | expr | |
26 | 18 25 | jaod | |
27 | 26 | expr | |
28 | simpll2 | |
|
29 | 28 | adantl | |
30 | 29 | necomd | |
31 | simprlr | |
|
32 | simprr | |
|
33 | btwnconn1 | |
|
34 | 8 9 11 10 12 33 | syl122anc | |
35 | 34 | adantr | |
36 | 30 31 32 35 | mp3and | |
37 | 36 | expr | |
38 | df-3an | |
|
39 | simpr3 | |
|
40 | simpr2 | |
|
41 | 8 9 12 11 10 39 40 | btwnexchand | |
42 | 41 | olcd | |
43 | 38 42 | sylan2br | |
44 | 43 | expr | |
45 | 37 44 | jaod | |
46 | 45 | expr | |
47 | 27 46 | jaod | |
48 | 47 | imp32 | |
49 | 5 6 48 | 3jca | |
50 | 49 | exp31 | |
51 | 4 50 | syl5 | |
52 | 51 | impd | |
53 | broutsideof2 | |
|
54 | 8 9 10 11 53 | syl13anc | |
55 | broutsideof2 | |
|
56 | 8 9 11 12 55 | syl13anc | |
57 | 54 56 | anbi12d | |
58 | df-3an | |
|
59 | df-3an | |
|
60 | 58 59 | anbi12i | |
61 | an4 | |
|
62 | 60 61 | bitr4i | |
63 | 57 62 | bitrdi | |
64 | broutsideof2 | |
|
65 | 8 9 10 12 64 | syl13anc | |
66 | 52 63 65 | 3imtr4d | |