Step |
Hyp |
Ref |
Expression |
1 |
|
funimage |
|
2 |
|
vex |
|
3 |
|
vex |
|
4 |
2 3
|
brimage |
|
5 |
|
eqvisset |
|
6 |
4 5
|
sylbi |
|
7 |
6
|
exlimiv |
|
8 |
|
eqid |
|
9 |
|
brimageg |
|
10 |
2 9
|
mpan |
|
11 |
8 10
|
mpbiri |
|
12 |
|
breq2 |
|
13 |
12
|
spcegv |
|
14 |
11 13
|
mpd |
|
15 |
7 14
|
impbii |
|
16 |
2
|
eldm |
|
17 |
|
imaeq2 |
|
18 |
17
|
eleq1d |
|
19 |
2 18
|
elab |
|
20 |
15 16 19
|
3bitr4i |
|
21 |
20
|
eqriv |
|
22 |
|
df-fn |
|
23 |
1 21 22
|
mpbir2an |
|