Step |
Hyp |
Ref |
Expression |
1 |
|
cdleme32sn2.d |
|
2 |
|
cdleme31sn2.n |
|
3 |
|
cdleme31sn2.c |
|
4 |
|
eqid |
|
5 |
2 4
|
cdleme31sn |
|
6 |
5
|
adantr |
|
7 |
|
iffalse |
|
8 |
1
|
csbeq2i |
|
9 |
7 8
|
eqtrdi |
|
10 |
|
nfcvd |
|
11 |
|
oveq1 |
|
12 |
|
oveq2 |
|
13 |
12
|
oveq1d |
|
14 |
13
|
oveq2d |
|
15 |
11 14
|
oveq12d |
|
16 |
10 15
|
csbiegf |
|
17 |
9 16
|
sylan9eqr |
|
18 |
6 17
|
eqtrd |
|
19 |
18 3
|
eqtr4di |
|