| Step | Hyp | Ref
| Expression |
| 1 | | difss 3737 |
. . . 4
      |
| 2 | | ackbij.f |
. . . . 5
       
        |
| 3 | 2 | ackbij1lem11 9052 |
. . . 4
   
     
       
   |
| 4 | 1, 3 | mpan2 707 |
. . 3
              |
| 5 | | difss 3737 |
. . . . . . 7
   |
| 6 | | omsson 7069 |
. . . . . . 7
 |
| 7 | 5, 6 | sstri 3612 |
. . . . . 6
   |
| 8 | | ominf 8172 |
. . . . . . . 8
 |
| 9 | | inss2 3834 |
. . . . . . . . 9
 
  |
| 10 | 9 | sseli 3599 |
. . . . . . . 8
      |
| 11 | | difinf 8230 |
. . . . . . . 8
       |
| 12 | 8, 10, 11 | sylancr 695 |
. . . . . . 7
        |
| 13 | | 0fin 8188 |
. . . . . . . . 9
 |
| 14 | | eleq1 2689 |
. . . . . . . . 9
  
  
   |
| 15 | 13, 14 | mpbiri 248 |
. . . . . . . 8
  
    |
| 16 | 15 | necon3bi 2820 |
. . . . . . 7
       |
| 17 | 12, 16 | syl 17 |
. . . . . 6
        |
| 18 | | onint 6995 |
. . . . . 6
   
  
       |
| 19 | 7, 17, 18 | sylancr 695 |
. . . . 5
           |
| 20 | 19 | eldifad 3586 |
. . . 4
         |
| 21 | | ackbij1lem4 9045 |
. . . 4
          
   |
| 22 | 20, 21 | syl 17 |
. . 3
          
   |
| 23 | | ackbij1lem6 9047 |
. . 3
        
                           |
| 24 | 4, 22, 23 | syl2anc 693 |
. 2
                     |
| 25 | 19 | eldifbd 3587 |
. . . . . 6
         |
| 26 | | disjsn 4246 |
. . . . . 6
             |
| 27 | 25, 26 | sylibr 224 |
. . . . 5
             |
| 28 | | ssdisj 4026 |
. . . . 5
      

                     |
| 29 | 1, 27, 28 | sylancr 695 |
. . . 4
                  |
| 30 | 2 | ackbij1lem9 9050 |
. . . 4
        
                                                            |
| 31 | 4, 22, 29, 30 | syl3anc 1326 |
. . 3
                                          |
| 32 | 2 | ackbij1lem14 9055 |
. . . . 5
                      |
| 33 | 20, 32 | syl 17 |
. . . 4
                      |
| 34 | 33 | oveq2d 6666 |
. . 3
                                            |
| 35 | 2 | ackbij1lem10 9051 |
. . . . . . 7
        |
| 36 | 35 | ffvelrni 6358 |
. . . . . 6
                    |
| 37 | 4, 36 | syl 17 |
. . . . 5
               |
| 38 | | ackbij1lem3 9044 |
. . . . . . 7
            |
| 39 | 20, 38 | syl 17 |
. . . . . 6
            |
| 40 | 35 | ffvelrni 6358 |
. . . . . 6
                |
| 41 | 39, 40 | syl 17 |
. . . . 5
             |
| 42 | | nnasuc 7686 |
. . . . 5
                       
                                 |
| 43 | 37, 41, 42 | syl2anc 693 |
. . . 4
                                          |
| 44 | | incom 3805 |
. . . . . . . . 9
             
       |
| 45 | | disjdif 4040 |
. . . . . . . . 9
           |
| 46 | 44, 45 | eqtri 2644 |
. . . . . . . 8
           |
| 47 | 46 | a1i 11 |
. . . . . . 7
                |
| 48 | 2 | ackbij1lem9 9050 |
. . . . . . 7
        
     
                                              |
| 49 | 4, 39, 47, 48 | syl3anc 1326 |
. . . . . 6
                      
               |
| 50 | | uncom 3757 |
. . . . . . . 8
                     |
| 51 | | onnmin 7003 |
. . . . . . . . . . . . . . 15
   
  
     |
| 52 | 7, 51 | mpan 706 |
. . . . . . . . . . . . . 14
  
     |
| 53 | 52 | con2i 134 |
. . . . . . . . . . . . 13
   
    |
| 54 | 53 | adantl 482 |
. . . . . . . . . . . 12
   

   
    |
| 55 | | ordom 7074 |
. . . . . . . . . . . . . . 15
 |
| 56 | | ordelss 5739 |
. . . . . . . . . . . . . . 15
        
  |
| 57 | 55, 20, 56 | sylancr 695 |
. . . . . . . . . . . . . 14
         |
| 58 | 57 | sselda 3603 |
. . . . . . . . . . . . 13
   

      |
| 59 | | eldif 3584 |
. . . . . . . . . . . . . . . 16
   
   |
| 60 | 59 | simplbi2 655 |
. . . . . . . . . . . . . . 15
 
     |
| 61 | 60 | orrd 393 |
. . . . . . . . . . . . . 14
 
     |
| 62 | 61 | orcomd 403 |
. . . . . . . . . . . . 13
       |
| 63 | 58, 62 | syl 17 |
. . . . . . . . . . . 12
   

          |
| 64 | | orel1 397 |
. . . . . . . . . . . 12
           |
| 65 | 54, 63, 64 | sylc 65 |
. . . . . . . . . . 11
   

      |
| 66 | 65 | ex 450 |
. . . . . . . . . 10
           |
| 67 | 66 | ssrdv 3609 |
. . . . . . . . 9
         |
| 68 | | undif 4049 |
. . . . . . . . 9
   
            |
| 69 | 67, 68 | sylib 208 |
. . . . . . . 8
                |
| 70 | 50, 69 | syl5eq 2668 |
. . . . . . 7
                |
| 71 | 70 | fveq2d 6195 |
. . . . . 6
                        |
| 72 | 49, 71 | eqtr3d 2658 |
. . . . 5
                            |
| 73 | | suceq 5790 |
. . . . 5
                      
                        |
| 74 | 72, 73 | syl 17 |
. . . 4
        
                   |
| 75 | 43, 74 | eqtrd 2656 |
. . 3
                            |
| 76 | 31, 34, 75 | 3eqtrd 2660 |
. 2
                          |
| 77 | | fveq2 6191 |
. . . 4
                                   |
| 78 | 77 | eqeq1d 2624 |
. . 3
                                             |
| 79 | 78 | rspcev 3309 |
. 2
                                                     |
| 80 | 24, 76, 79 | syl2anc 693 |
1
                   |