Description: The outer five segment predicate commutes. (Contributed by Scott Fenton, 26-Sep-2013)
Ref | Expression | ||
---|---|---|---|
Assertion | ofscom | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ancom | |
|
2 | 1 | a1i | |
3 | simp11 | |
|
4 | simp12 | |
|
5 | simp13 | |
|
6 | simp23 | |
|
7 | simp31 | |
|
8 | cgrcom | |
|
9 | 3 4 5 6 7 8 | syl122anc | |
10 | simp21 | |
|
11 | simp32 | |
|
12 | cgrcom | |
|
13 | 3 5 10 7 11 12 | syl122anc | |
14 | 9 13 | anbi12d | |
15 | simp22 | |
|
16 | simp33 | |
|
17 | cgrcom | |
|
18 | 3 4 15 6 16 17 | syl122anc | |
19 | cgrcom | |
|
20 | 3 5 15 7 16 19 | syl122anc | |
21 | 18 20 | anbi12d | |
22 | 2 14 21 | 3anbi123d | |
23 | brofs | |
|
24 | brofs | |
|
25 | 3 6 7 11 16 4 5 10 15 24 | syl333anc | |
26 | 22 23 25 | 3bitr4d | |