Proof of Theorem fiv
| Step | Hyp | Ref
| Expression |
| 1 | | elisset 2299 |
. 2

  |
| 2 | | uniexg 3795 |
. . . . . 6

   |
| 3 | | pwexg 3489 |
. . . . . 6
 
    |
| 4 | 2, 3 | syl 12 |
. . . . 5

    |
| 5 | | rabexg 3460 |
. . . . 5
     
  
     |
| 6 | 4, 5 | syl 12 |
. . . 4

  
  
     |
| 7 | | df-rab 2112 |
. . . 4
     
      
  
     |
| 8 | 6, 7 | syl5eqelr 1976 |
. . 3

      
      |
| 9 | | simpr 350 |
. . . . 5
   
  
     
    |
| 10 | | visset 2295 |
. . . . . . . . 9
 |
| 11 | | eleq1 1957 |
. . . . . . . . . . . 12
       |
| 12 | | intex 3465 |
. . . . . . . . . . . . 13
    |
| 13 | | intssuni2 3243 |
. . . . . . . . . . . . . . . 16
  
    |
| 14 | 13 | ex 402 |
. . . . . . . . . . . . . . 15
       |
| 15 | | sseq1 2637 |
. . . . . . . . . . . . . . . . 17
         |
| 16 | 15 | biimprd 171 |
. . . . . . . . . . . . . . . 16
    
    |
| 17 | 10 | elpw 3037 |
. . . . . . . . . . . . . . . . . 18

     |
| 18 | 17 | biimpri 169 |
. . . . . . . . . . . . . . . . 17
      |
| 19 | 18 | a1d 15 |
. . . . . . . . . . . . . . . 16
  
     |
| 20 | 16, 19 | syl6com 64 |
. . . . . . . . . . . . . . 15
  
  
      |
| 21 | 14, 20 | syl6 25 |
. . . . . . . . . . . . . 14
   
        |
| 22 | 21 | com3l 38 |
. . . . . . . . . . . . 13
  


       |
| 23 | 12, 22 | sylbir 218 |
. . . . . . . . . . . 12
   


       |
| 24 | 11, 23 | syl6bi 231 |
. . . . . . . . . . 11
    


        |
| 25 | 24 | pm2.43a 80 |
. . . . . . . . . 10
    
       |
| 26 | 25 | com4l 43 |
. . . . . . . . 9

   
       |
| 27 | 10, 26 | ax-mp 7 |
. . . . . . . 8
   
      |
| 28 | 27 | 3imp 1061 |
. . . . . . 7
 
      |
| 29 | 28 | 19.23aiv 1674 |
. . . . . 6
   
      |
| 30 | 29 | ancri 321 |
. . . . 5
   
    
  
     |
| 31 | 9, 30 | impbii 174 |
. . . 4
   
  
     
    |
| 32 | 31 | abbii 2006 |
. . 3
      
       
    |
| 33 | 8, 32 | syl5eqelr 1976 |
. 2

   
     |
| 34 | | sseq2 2639 |
. . . . . 6
     |
| 35 | 34 | 3anbi1d 1172 |
. . . . 5
  
  
     |
| 36 | 35 | exbidv 1657 |
. . . 4
    
    
     |
| 37 | 36 | abbidv 2008 |
. . 3
    
      
     |
| 38 | | df-fi 10211 |
. . . 4
fi     
  
     |
| 39 | | relopab 4104 |
. . . . 5
    
  
     |
| 40 | | resid 4258 |
. . . . 5
        
            
         
  
      |
| 41 | 39, 40 | ax-mp 7 |
. . . 4
        
         
  
     |
| 42 | | resopab 4252 |
. . . 4
        
             
      |
| 43 | 38, 41, 42 | 3eqtr2i 1915 |
. . 3
fi         
      |
| 44 | 37, 43 | fvopab4g 4742 |
. 2
     
    fi   
  
     |
| 45 | 1, 33, 44 | syl11anc 524 |
1

fi      
     |