Step |
Hyp |
Ref |
Expression |
1 |
|
dfifp4 |
|
2 |
|
dfifp4 |
|
3 |
1 2
|
imbi12i |
|
4 |
|
imor |
|
5 |
|
ordi |
|
6 |
|
orass |
|
7 |
|
ianor |
|
8 |
|
pm4.52 |
|
9 |
8
|
bicomi |
|
10 |
|
ioran |
|
11 |
9 10
|
orbi12i |
|
12 |
|
cases2 |
|
13 |
|
imor |
|
14 |
|
pm4.66 |
|
15 |
13 14
|
anbi12i |
|
16 |
12 15
|
bitri |
|
17 |
7 11 16
|
3bitri |
|
18 |
17
|
orbi1i |
|
19 |
|
orcom |
|
20 |
|
ordi |
|
21 |
19 20
|
bitri |
|
22 |
|
orass |
|
23 |
|
orcom |
|
24 |
|
imor |
|
25 |
23 24
|
bitr4i |
|
26 |
25
|
orbi1i |
|
27 |
22 26
|
bitr3i |
|
28 |
|
orass |
|
29 |
|
imor |
|
30 |
29
|
bicomi |
|
31 |
30
|
orbi1i |
|
32 |
28 31
|
bitr3i |
|
33 |
27 32
|
anbi12i |
|
34 |
18 21 33
|
3bitri |
|
35 |
34
|
orbi1i |
|
36 |
|
ordir |
|
37 |
|
orass |
|
38 |
|
imor |
|
39 |
38
|
bicomi |
|
40 |
39
|
orbi2i |
|
41 |
37 40
|
bitri |
|
42 |
|
orass |
|
43 |
|
imor |
|
44 |
43
|
bicomi |
|
45 |
44
|
orbi2i |
|
46 |
42 45
|
bitri |
|
47 |
41 46
|
anbi12i |
|
48 |
35 36 47
|
3bitri |
|
49 |
6 48
|
bitr3i |
|
50 |
|
orass |
|
51 |
17
|
orbi1i |
|
52 |
|
orcom |
|
53 |
|
ordi |
|
54 |
52 53
|
bitri |
|
55 |
|
orass |
|
56 |
|
orcom |
|
57 |
|
imor |
|
58 |
56 57
|
bitr4i |
|
59 |
58
|
orbi1i |
|
60 |
55 59
|
bitr3i |
|
61 |
|
orass |
|
62 |
|
df-or |
|
63 |
62
|
orbi1i |
|
64 |
61 63
|
bitr3i |
|
65 |
60 64
|
anbi12i |
|
66 |
51 54 65
|
3bitri |
|
67 |
66
|
orbi1i |
|
68 |
|
ordir |
|
69 |
|
orass |
|
70 |
|
imor |
|
71 |
70
|
bicomi |
|
72 |
71
|
orbi2i |
|
73 |
69 72
|
bitri |
|
74 |
|
orass |
|
75 |
|
imor |
|
76 |
75
|
bicomi |
|
77 |
76
|
orbi2i |
|
78 |
74 77
|
bitri |
|
79 |
73 78
|
anbi12i |
|
80 |
67 68 79
|
3bitri |
|
81 |
50 80
|
bitr3i |
|
82 |
49 81
|
anbi12i |
|
83 |
5 82
|
bitri |
|
84 |
3 4 83
|
3bitri |
|