Step | Hyp | Ref
| Expression |
1 | | wunnat.1 |
. 2
 WUni |
2 | | wunnat.2 |
. . . 4
   |
3 | | wunnat.3 |
. . . 4
   |
4 | 1, 2, 3 | wunfunc 16559 |
. . 3
     |
5 | 1, 4, 4 | wunxp 9546 |
. 2
         |
6 | | df-hom 15966 |
. . . . . . 7
Slot ;  |
7 | 6, 1, 3 | wunstr 15881 |
. . . . . 6
      |
8 | 1, 7 | wunrn 9551 |
. . . . 5
      |
9 | 1, 8 | wununi 9528 |
. . . 4
       |
10 | | df-base 15863 |
. . . . 5
Slot  |
11 | 10, 1, 2 | wunstr 15881 |
. . . 4
       |
12 | 1, 9, 11 | wunmap 9548 |
. . 3
             |
13 | 1, 12 | wunpw 9529 |
. 2
              |
14 | | fvex 6201 |
. . . . . 6
     |
15 | | fvex 6201 |
. . . . . . . . 9
     |
16 | | ssrab2 3687 |
. . . . . . . . . . . . 13
                                                              comp                                                 comp              
                      |
17 | | ovssunirn 6681 |
. . . . . . . . . . . . . . . 16
                    |
18 | 17 | rgenw 2924 |
. . . . . . . . . . . . . . 15
                          |
19 | | ss2ixp 7921 |
. . . . . . . . . . . . . . 15
 
                       
                                 |
20 | 18, 19 | ax-mp 5 |
. . . . . . . . . . . . . 14
                                |
21 | | fvex 6201 |
. . . . . . . . . . . . . . 15
     |
22 | | fvex 6201 |
. . . . . . . . . . . . . . . . 17
    |
23 | 22 | rnex 7100 |
. . . . . . . . . . . . . . . 16
    |
24 | 23 | uniex 6953 |
. . . . . . . . . . . . . . 15
     |
25 | 21, 24 | ixpconst 7918 |
. . . . . . . . . . . . . 14
                     |
26 | 20, 25 | sseqtri 3637 |
. . . . . . . . . . . . 13
                         
      |
27 | 16, 26 | sstri 3612 |
. . . . . . . . . . . 12
                                                              comp                                                 comp              
    
      |
28 | | ovex 6678 |
. . . . . . . . . . . . 13
    
      |
29 | 28 | elpw2 4828 |
. . . . . . . . . . . 12
                       
                                       comp                                                 comp                    
    
                                                              comp                                                 comp              
    
       |
30 | 27, 29 | mpbir 221 |
. . . . . . . . . . 11
                                                              comp                                                 comp                    
      |
31 | 30 | sbcth 3450 |
. . . . . . . . . 10
           ![]. ].](_drbrack.gif)  
                          
     
  
                        comp                                                 comp                    
       |
32 | | sbcel1g 3987 |
. . . . . . . . . 10
            ![]. ].](_drbrack.gif)  
                          
     
  
                        comp                                                 comp                    
    
      ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
        |
33 | 31, 32 | mpbid 222 |
. . . . . . . . 9
           ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
       |
34 | 15, 33 | ax-mp 5 |
. . . . . . . 8
      ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
      |
35 | 34 | sbcth 3450 |
. . . . . . 7
           ![]. ].](_drbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
       |
36 | | sbcel1g 3987 |
. . . . . . 7
            ![]. ].](_drbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
    
      ![]_ ]_](_urbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
        |
37 | 35, 36 | mpbid 222 |
. . . . . 6
           ![]_ ]_](_urbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
       |
38 | 14, 37 | ax-mp 5 |
. . . . 5
      ![]_ ]_](_urbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
      |
39 | 38 | rgen2w 2925 |
. . . 4
              ![]_ ]_](_urbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
      |
40 | | eqid 2622 |
. . . . . 6
 Nat   Nat   |
41 | | eqid 2622 |
. . . . . 6
         |
42 | | eqid 2622 |
. . . . . 6
       |
43 | | eqid 2622 |
. . . . . 6
       |
44 | | eqid 2622 |
. . . . . 6
comp  comp   |
45 | 40, 41, 42, 43, 44 | natfval 16606 |
. . . . 5
 Nat              ![]_ ]_](_urbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                 |
46 | 45 | fmpt2 7237 |
. . . 4
 
             ![]_ ]_](_urbrack.gif)       ![]_ ]_](_urbrack.gif)  
                          
     
  
                        comp                                                 comp                    
    
 Nat     
           
       |
47 | 39, 46 | mpbi 220 |
. . 3
 Nat                        |
48 | 47 | a1i 11 |
. 2
  Nat                         |
49 | 1, 5, 13, 48 | wunf 9549 |
1
  Nat    |