Step |
Hyp |
Ref |
Expression |
1 |
|
funfn |
|
2 |
|
elin |
|
3 |
2
|
biancomi |
|
4 |
3
|
anbi1i |
|
5 |
|
fvres |
|
6 |
5
|
eleq1d |
|
7 |
6
|
adantl |
|
8 |
7
|
pm5.32i |
|
9 |
4 8
|
bitri |
|
10 |
9
|
a1i |
|
11 |
|
an32 |
|
12 |
10 11
|
bitrdi |
|
13 |
|
fnfun |
|
14 |
|
funres |
|
15 |
13 14
|
syl |
|
16 |
|
dmres |
|
17 |
|
df-fn |
|
18 |
15 16 17
|
sylanblrc |
|
19 |
|
elpreima |
|
20 |
18 19
|
syl |
|
21 |
|
elin |
|
22 |
|
elpreima |
|
23 |
22
|
anbi1d |
|
24 |
21 23
|
syl5bb |
|
25 |
12 20 24
|
3bitr4d |
|
26 |
1 25
|
sylbi |
|
27 |
26
|
eqrdv |
|