Step |
Hyp |
Ref |
Expression |
1 |
|
cvrletr.b |
|
2 |
|
cvrletr.l |
|
3 |
|
cvrletr.s |
|
4 |
|
cvrletr.c |
|
5 |
1 3 4
|
cvrnbtwn |
|
6 |
2 3
|
pltval |
|
7 |
6
|
3adant3r2 |
|
8 |
7
|
3adant3 |
|
9 |
8
|
anbi1d |
|
10 |
9
|
notbid |
|
11 |
|
an32 |
|
12 |
|
df-ne |
|
13 |
12
|
anbi2i |
|
14 |
11 13
|
bitri |
|
15 |
14
|
notbii |
|
16 |
|
iman |
|
17 |
15 16
|
bitr4i |
|
18 |
10 17
|
bitrdi |
|
19 |
5 18
|
mpbid |
|
20 |
1 2
|
posref |
|
21 |
|
breq2 |
|
22 |
20 21
|
syl5ibcom |
|
23 |
22
|
3ad2antr1 |
|
24 |
23
|
3adant3 |
|
25 |
|
simp1 |
|
26 |
|
simp21 |
|
27 |
|
simp22 |
|
28 |
|
simp3 |
|
29 |
1 3 4
|
cvrlt |
|
30 |
25 26 27 28 29
|
syl31anc |
|
31 |
|
breq1 |
|
32 |
30 31
|
syl5ibcom |
|
33 |
24 32
|
jcad |
|
34 |
19 33
|
impbid |
|