Step |
Hyp |
Ref |
Expression |
1 |
|
derang.d |
|
2 |
|
snfi |
|
3 |
1
|
derangval |
|
4 |
2 3
|
ax-mp |
|
5 |
|
f1of |
|
6 |
5
|
adantr |
|
7 |
|
snidg |
|
8 |
|
ffvelrn |
|
9 |
6 7 8
|
syl2anr |
|
10 |
|
simpr |
|
11 |
|
fveq2 |
|
12 |
|
id |
|
13 |
11 12
|
neeq12d |
|
14 |
13
|
rspcva |
|
15 |
7 10 14
|
syl2an |
|
16 |
|
nelsn |
|
17 |
15 16
|
syl |
|
18 |
9 17
|
pm2.21dd |
|
19 |
18
|
ex |
|
20 |
19
|
abssdv |
|
21 |
|
ss0 |
|
22 |
20 21
|
syl |
|
23 |
22
|
fveq2d |
|
24 |
4 23
|
syl5eq |
|
25 |
|
hash0 |
|
26 |
24 25
|
eqtrdi |
|