Step |
Hyp |
Ref |
Expression |
1 |
|
2cycld.1 |
|
2 |
|
2cycld.2 |
|
3 |
|
2cycld.3 |
|
4 |
|
2cycld.4 |
|
5 |
|
2cycld.5 |
|
6 |
|
2cycld.6 |
|
7 |
|
2cycld.7 |
|
8 |
|
2cycld.8 |
|
9 |
|
2cycld.9 |
|
10 |
1 2 3 4 5 6 7 8
|
2pthd |
|
11 |
1
|
fveq1i |
|
12 |
|
s3fv0 |
|
13 |
11 12
|
syl5eq |
|
14 |
13
|
3ad2ant1 |
|
15 |
14
|
adantr |
|
16 |
|
simpr |
|
17 |
2
|
fveq2i |
|
18 |
|
s2len |
|
19 |
17 18
|
eqtri |
|
20 |
1 19
|
fveq12i |
|
21 |
|
s3fv2 |
|
22 |
20 21
|
eqtr2id |
|
23 |
22
|
3ad2ant3 |
|
24 |
23
|
adantr |
|
25 |
15 16 24
|
3eqtrd |
|
26 |
3 9 25
|
syl2anc |
|
27 |
|
iscycl |
|
28 |
10 26 27
|
sylanbrc |
|