| Step | Hyp | Ref
| Expression |
| 1 | | catpropd.1 |
. . . . . 6
 
f   
f     |
| 2 | 1 | homfeqbas 16356 |
. . . . 5
           |
| 3 | 2 | adantr 481 |
. . . 4
 

          |
| 4 | | eqid 2622 |
. . . . . . . . . 10
         |
| 5 | | eqid 2622 |
. . . . . . . . . 10
       |
| 6 | | eqid 2622 |
. . . . . . . . . 10
       |
| 7 | 1 | ad4antr 768 |
. . . . . . . . . 10
     
                 
 f    f     |
| 8 | | simpr 477 |
. . . . . . . . . 10
     
                 
      |
| 9 | | simpllr 799 |
. . . . . . . . . 10
     
                 
      |
| 10 | 4, 5, 6, 7, 8, 9 | homfeqval 16357 |
. . . . . . . . 9
     
                 
  
             |
| 11 | | eqid 2622 |
. . . . . . . . . . 11
comp  comp   |
| 12 | | eqid 2622 |
. . . . . . . . . . 11
comp  comp   |
| 13 | 1 | ad5antr 770 |
. . . . . . . . . . 11
     

                         
 f    f     |
| 14 | | catpropd.2 |
. . . . . . . . . . . 12
 compf  compf    |
| 15 | 14 | ad5antr 770 |
. . . . . . . . . . 11
     

                         
compf  compf    |
| 16 | | simplr 792 |
. . . . . . . . . . 11
     

                         
      |
| 17 | | simp-4r 807 |
. . . . . . . . . . 11
     

                         
      |
| 18 | | simpr 477 |
. . . . . . . . . . 11
     

                         
         |
| 19 | | simpllr 799 |
. . . . . . . . . . 11
     

                         
         |
| 20 | 4, 5, 11, 12, 13, 15, 16, 17, 17, 18, 19 | comfeqval 16368 |
. . . . . . . . . 10
     

                         
       comp             comp        |
| 21 | 20 | eqeq1d 2624 |
. . . . . . . . 9
     

                         
        comp     
       comp         |
| 22 | 10, 21 | raleqbidva 3154 |
. . . . . . . 8
     
                 
 
  
            comp     
                comp         |
| 23 | 4, 5, 6, 7, 9, 8 | homfeqval 16357 |
. . . . . . . . 9
     
                 
  
             |
| 24 | 7 | adantr 481 |
. . . . . . . . . . 11
     

                         
 f    f     |
| 25 | 14 | ad5antr 770 |
. . . . . . . . . . 11
     

                         
compf  compf    |
| 26 | 9 | adantr 481 |
. . . . . . . . . . 11
     

                         
      |
| 27 | | simplr 792 |
. . . . . . . . . . 11
     

                         
      |
| 28 | | simpllr 799 |
. . . . . . . . . . 11
     

                         
         |
| 29 | | simpr 477 |
. . . . . . . . . . 11
     

                         
         |
| 30 | 4, 5, 11, 12, 24, 25, 26, 26, 27, 28, 29 | comfeqval 16368 |
. . . . . . . . . 10
     

                         
       comp             comp        |
| 31 | 30 | eqeq1d 2624 |
. . . . . . . . 9
     

                         
        comp     
       comp         |
| 32 | 23, 31 | raleqbidva 3154 |
. . . . . . . 8
     
                 
 
  
            comp     
                comp         |
| 33 | 22, 32 | anbi12d 747 |
. . . . . . 7
     
                 
  
               comp                      comp                        comp                      comp          |
| 34 | 33 | ralbidva 2985 |
. . . . . 6
   

                                     comp                      comp                              comp                      comp          |
| 35 | 34 | riotabidva 6627 |
. . . . 5
                   
      
  
            comp      
  
            comp                                         comp                      comp          |
| 36 | 1 | ad2antrr 762 |
. . . . . . 7
          f    f     |
| 37 | | simpr 477 |
. . . . . . 7
               |
| 38 | 4, 5, 6, 36, 37, 37 | homfeqval 16357 |
. . . . . 6
                         |
| 39 | 2 | ad2antrr 762 |
. . . . . . 7
                   |
| 40 | 39 | raleqdv 3144 |
. . . . . 6
          
                      comp                      comp       
                      comp                      comp          |
| 41 | 38, 40 | riotaeqbidv 6614 |
. . . . 5
                   
      
  
            comp      
  
            comp                                         comp                      comp          |
| 42 | 35, 41 | eqtrd 2656 |
. . . 4
                   
      
  
            comp      
  
            comp                                         comp                      comp          |
| 43 | 3, 42 | mpteq12dva 4732 |
. . 3
 

                                      comp                      comp                        
      
  
            comp      
  
            comp           |
| 44 | | simpr 477 |
. . . 4
 

  |
| 45 | | eqid 2622 |
. . . 4
         |
| 46 | 4, 5, 11, 44, 45 | cidfval 16337 |
. . 3
 

                   
      
  
            comp      
  
            comp           |
| 47 | | eqid 2622 |
. . . 4
         |
| 48 | | catpropd.3 |
. . . . . 6
   |
| 49 | | catpropd.4 |
. . . . . 6
   |
| 50 | 1, 14, 48, 49 | catpropd 16369 |
. . . . 5
     |
| 51 | 50 | biimpa 501 |
. . . 4
 

  |
| 52 | | eqid 2622 |
. . . 4
         |
| 53 | 47, 6, 12, 51, 52 | cidfval 16337 |
. . 3
 

                   
      
  
            comp      
  
            comp           |
| 54 | 43, 46, 53 | 3eqtr4d 2666 |
. 2
 

          |
| 55 | | simpr 477 |
. . . . 5
 

  |
| 56 | | cidffn 16339 |
. . . . . . 7
 |
| 57 | | fndm 5990 |
. . . . . . 7
   |
| 58 | 56, 57 | ax-mp 5 |
. . . . . 6
 |
| 59 | 58 | eleq2i 2693 |
. . . . 5

  |
| 60 | 55, 59 | sylnibr 319 |
. . . 4
 

  |
| 61 | | ndmfv 6218 |
. . . 4
       |
| 62 | 60, 61 | syl 17 |
. . 3
 
       |
| 63 | 58 | eleq2i 2693 |
. . . . . . 7

  |
| 64 | 50, 63 | syl6bbr 278 |
. . . . . 6
     |
| 65 | 64 | notbid 308 |
. . . . 5
     |
| 66 | 65 | biimpa 501 |
. . . 4
 

  |
| 67 | | ndmfv 6218 |
. . . 4
       |
| 68 | 66, 67 | syl 17 |
. . 3
 
       |
| 69 | 62, 68 | eqtr4d 2659 |
. 2
 
           |
| 70 | 54, 69 | pm2.61dan 832 |
1
           |