Proof of Theorem ov3
| Step | Hyp | Ref
| Expression |
| 1 | | ov3.1 |
. . 3
 |
| 2 | 1 | isseti 3209 |
. 2
  |
| 3 | | nfv 1843 |
. . 3
     
   |
| 4 | | nfcv 2764 |
. . . . 5
      |
| 5 | | ov3.3 |
. . . . . 6
     
    

                  
    |
| 6 | | nfoprab3 6706 |
. . . . . 6
       
    

                  
    |
| 7 | 5, 6 | nfcxfr 2762 |
. . . . 5
   |
| 8 | | nfcv 2764 |
. . . . 5
      |
| 9 | 4, 7, 8 | nfov 6676 |
. . . 4
             |
| 10 | 9 | nfeq1 2778 |
. . 3
             |
| 11 | | ov3.2 |
. . . . . . 7
      
  |
| 12 | 11 | eqeq2d 2632 |
. . . . . 6
           |
| 13 | 12 | copsex4g 4959 |
. . . . 5
  


                         
    |
| 14 | | opelxpi 5148 |
. . . . . 6
 
        |
| 15 | | opelxpi 5148 |
. . . . . 6
 
        |
| 16 | | nfcv 2764 |
. . . . . . 7
      |
| 17 | | nfcv 2764 |
. . . . . . 7
      |
| 18 | | nfcv 2764 |
. . . . . . 7
      |
| 19 | | nfv 1843 |
. . . . . . . 8
                     
  |
| 20 | | nfoprab1 6704 |
. . . . . . . . . . 11
       
    

                  
    |
| 21 | 5, 20 | nfcxfr 2762 |
. . . . . . . . . 10
   |
| 22 | | nfcv 2764 |
. . . . . . . . . 10
   |
| 23 | 16, 21, 22 | nfov 6676 |
. . . . . . . . 9
          |
| 24 | 23 | nfeq1 2778 |
. . . . . . . 8
          |
| 25 | 19, 24 | nfim 1825 |
. . . . . . 7
                      
          |
| 26 | | nfv 1843 |
. . . . . . . 8
                        
  |
| 27 | | nfoprab2 6705 |
. . . . . . . . . . 11
       
    

                  
    |
| 28 | 5, 27 | nfcxfr 2762 |
. . . . . . . . . 10
   |
| 29 | 17, 28, 18 | nfov 6676 |
. . . . . . . . 9
             |
| 30 | 29 | nfeq1 2778 |
. . . . . . . 8
             |
| 31 | 26, 30 | nfim 1825 |
. . . . . . 7
                         

            |
| 32 | | eqeq1 2626 |
. . . . . . . . . . 11
         
       |
| 33 | 32 | anbi1d 741 |
. . . . . . . . . 10
                   
       |
| 34 | 33 | anbi1d 741 |
. . . . . . . . 9
             

       
   
    |
| 35 | 34 | 4exbidv 1854 |
. . . . . . . 8
                     
                    
    |
| 36 | | oveq1 6657 |
. . . . . . . . 9
                 |
| 37 | 36 | eqeq1d 2624 |
. . . . . . . 8
                   |
| 38 | 35, 37 | imbi12d 334 |
. . . . . . 7
                      
     
            
   
   

           |
| 39 | | eqeq1 2626 |
. . . . . . . . . . 11
         
       |
| 40 | 39 | anbi2d 740 |
. . . . . . . . . 10
       
   
                     |
| 41 | 40 | anbi1d 741 |
. . . . . . . . 9
            
   
    
          
    |
| 42 | 41 | 4exbidv 1854 |
. . . . . . . 8
                
   
   
                       
    |
| 43 | | oveq2 6658 |
. . . . . . . . 9
                       |
| 44 | 43 | eqeq1d 2624 |
. . . . . . . 8
       
                 |
| 45 | 42, 44 | imbi12d 334 |
. . . . . . 7
                         

                               

              |
| 46 | | moeq 3382 |
. . . . . . . . . . . 12
  |
| 47 | 46 | mosubop 4973 |
. . . . . . . . . . 11
            |
| 48 | 47 | mosubop 4973 |
. . . . . . . . . 10
                     |
| 49 | | anass 681 |
. . . . . . . . . . . . . 14
         

       
    |
| 50 | 49 | 2exbii 1775 |
. . . . . . . . . . . . 13
             

                |
| 51 | | 19.42vv 1920 |
. . . . . . . . . . . . 13
              
           
    |
| 52 | 50, 51 | bitri 264 |
. . . . . . . . . . . 12
             

           
    |
| 53 | 52 | 2exbii 1775 |
. . . . . . . . . . 11
                 

                    |
| 54 | 53 | mobii 2493 |
. . . . . . . . . 10
               
   
                       |
| 55 | 48, 54 | mpbir 221 |
. . . . . . . . 9
                  
  |
| 56 | 55 | a1i 11 |
. . . . . . . 8
   
                 
   
   |
| 57 | 56, 5 | ovidi 6779 |
. . . . . . 7
   
                
   

       |
| 58 | 16, 17, 18, 25, 31, 38, 45, 57 | vtocl2gaf 3273 |
. . . . . 6
      
                  
          
              |
| 59 | 14, 15, 58 | syl2an 494 |
. . . . 5
  


                         

             |
| 60 | 13, 59 | sylbird 250 |
. . . 4
  


                |
| 61 | | eqeq2 2633 |
. . . 4
           
             |
| 62 | 60, 61 | mpbidi 231 |
. . 3
  


                |
| 63 | 3, 10, 62 | exlimd 2087 |
. 2
  


                 |
| 64 | 2, 63 | mpi 20 |
1
  


              |