Step |
Hyp |
Ref |
Expression |
1 |
|
f12dfv.a |
|
2 |
|
dff14b |
|
3 |
1
|
raleqi |
|
4 |
|
sneq |
|
5 |
4
|
difeq2d |
|
6 |
|
fveq2 |
|
7 |
6
|
neeq1d |
|
8 |
5 7
|
raleqbidv |
|
9 |
|
sneq |
|
10 |
9
|
difeq2d |
|
11 |
|
fveq2 |
|
12 |
11
|
neeq1d |
|
13 |
10 12
|
raleqbidv |
|
14 |
8 13
|
ralprg |
|
15 |
14
|
adantr |
|
16 |
1
|
difeq1i |
|
17 |
|
difprsn1 |
|
18 |
16 17
|
syl5eq |
|
19 |
18
|
adantl |
|
20 |
19
|
raleqdv |
|
21 |
|
fveq2 |
|
22 |
21
|
neeq2d |
|
23 |
22
|
ralsng |
|
24 |
23
|
adantl |
|
25 |
24
|
adantr |
|
26 |
20 25
|
bitrd |
|
27 |
1
|
difeq1i |
|
28 |
|
difprsn2 |
|
29 |
27 28
|
syl5eq |
|
30 |
29
|
adantl |
|
31 |
30
|
raleqdv |
|
32 |
|
fveq2 |
|
33 |
32
|
neeq2d |
|
34 |
33
|
ralsng |
|
35 |
34
|
adantr |
|
36 |
35
|
adantr |
|
37 |
31 36
|
bitrd |
|
38 |
26 37
|
anbi12d |
|
39 |
|
necom |
|
40 |
39
|
biimpi |
|
41 |
40
|
pm4.71i |
|
42 |
38 41
|
bitr4di |
|
43 |
15 42
|
bitrd |
|
44 |
3 43
|
syl5bb |
|
45 |
44
|
anbi2d |
|
46 |
2 45
|
syl5bb |
|