| Step | Hyp | Ref
| Expression |
| 1 | | nn0uz 9791 |
. . . 4
     |
| 2 | | 0zd 9491 |
. . . 4
   |
| 3 | | nn0ex 9408 |
. . . . . . 7
 |
| 4 | 3 | mptex 5880 |
. . . . . 6

             |
| 5 | | vex 2805 |
. . . . . 6
 |
| 6 | 4, 5 | fvex 5659 |
. . . . 5
                  |
| 7 | 6 | a1i 9 |
. . . 4
 

                   |
| 8 | | eqid 2231 |
. . . . . 6
        
      |
| 9 | | vex 2805 |
. . . . . . 7
 |
| 10 | | vex 2805 |
. . . . . . 7
 |
| 11 | 9, 10 | fvex 5659 |
. . . . . 6
     |
| 12 | | vex 2805 |
. . . . . 6
 |
| 13 | 8, 11, 5, 12 | mpofvexi 6371 |
. . . . 5
   
        |
| 14 | 13 | a1i 9 |
. . . 4
 
                |
| 15 | 1, 2, 7, 14 | seqf 10727 |
. . 3
     
              
           |
| 16 | | depindlem1.4 |
. . . 4
    
              
      |
| 17 | 16 | feq1i 5475 |
. . 3
    
                               |
| 18 | 15, 17 | sylibr 134 |
. 2
       |
| 19 | 16 | fveq1i 5640 |
. . . 4
        
                        |
| 20 | 6 | a1i 9 |
. . . . 5
 
    
                   |
| 21 | 2, 20, 14 | seq3-1 10725 |
. . . 4
     
                                          |
| 22 | 19, 21 | eqtrid 2276 |
. . 3
                        |
| 23 | | 0nn0 9417 |
. . . 4
 |
| 24 | | depind.0 |
. . . 4
       |
| 25 | | iftrue 3610 |
. . . . 5
  
           |
| 26 | | eqid 2231 |
. . . . 5

            
             |
| 27 | 25, 26 | fvmptg 5722 |
. . . 4
 
      
                 |
| 28 | 23, 24, 27 | sylancr 414 |
. . 3
          
         |
| 29 | 22, 28 | eqtrd 2264 |
. 2
       |
| 30 | | simpr 110 |
. . . . . . . . 9
 

  |
| 31 | 30, 1 | eleqtrdi 2324 |
. . . . . . . 8
 

      |
| 32 | 6 | a1i 9 |
. . . . . . . 8
        
                   |
| 33 | 13 | a1i 9 |
. . . . . . . 8
    
 
   
         |
| 34 | 31, 32, 33 | seq3p1 10728 |
. . . . . . 7
 

                                   
                                                      |
| 35 | 16 | fveq1i 5640 |
. . . . . . 7
          
                          |
| 36 | 16 | fveq1i 5640 |
. . . . . . . 8
        
                        |
| 37 | 36 | oveq1i 6028 |
. . . . . . 7
       
                               
              
          
                           |
| 38 | 34, 35, 37 | 3eqtr4g 2289 |
. . . . . 6
 

                                          |
| 39 | | eqeq1 2238 |
. . . . . . . . . 10
         |
| 40 | | fvoveq1 6041 |
. . . . . . . . . 10
                   |
| 41 | 39, 40 | ifbieq2d 3630 |
. . . . . . . . 9
    
                          |
| 42 | | nn0p1nn 9441 |
. . . . . . . . . . 11

    |
| 43 | 42 | adantl 277 |
. . . . . . . . . 10
 

    |
| 44 | 43 | nnnn0d 9455 |
. . . . . . . . 9
 

    |
| 45 | 43 | nnne0d 9188 |
. . . . . . . . . . . . 13
 

    |
| 46 | 45 | neneqd 2423 |
. . . . . . . . . . . 12
 

    |
| 47 | 46 | iffalsed 3615 |
. . . . . . . . . . 11
 

                         |
| 48 | 30 | nn0cnd 9457 |
. . . . . . . . . . . . 13
 

  |
| 49 | | pncan1 8556 |
. . . . . . . . . . . . 13
       |
| 50 | 48, 49 | syl 14 |
. . . . . . . . . . . 12
 

      |
| 51 | 50 | fveq2d 5643 |
. . . . . . . . . . 11
 

              |
| 52 | 47, 51 | eqtrd 2264 |
. . . . . . . . . 10
 

                     |
| 53 | | depind.h |
. . . . . . . . . . . 12
                      |
| 54 | | fveq2 5639 |
. . . . . . . . . . . . . 14
           |
| 55 | | fveq2 5639 |
. . . . . . . . . . . . . 14
           |
| 56 | | fvoveq1 6041 |
. . . . . . . . . . . . . 14
               |
| 57 | 54, 55, 56 | feq123d 5473 |
. . . . . . . . . . . . 13
                                         |
| 58 | 57 | rspccva 2909 |
. . . . . . . . . . . 12
                    
                     |
| 59 | 53, 58 | sylan 283 |
. . . . . . . . . . 11
 

                    |
| 60 | | depind.p |
. . . . . . . . . . . 12
       |
| 61 | 60 | ffvelcdmda 5782 |
. . . . . . . . . . 11
 

      |
| 62 | 59, 61 | fexd 5884 |
. . . . . . . . . 10
 

      |
| 63 | 52, 62 | eqeltrd 2308 |
. . . . . . . . 9
 

                 |
| 64 | 26, 41, 44, 63 | fvmptd3 5740 |
. . . . . . . 8
 

                                    |
| 65 | 64, 52 | eqtrd 2264 |
. . . . . . 7
 

                         |
| 66 | 65 | oveq2d 6034 |
. . . . . 6
 

       
                                 
             |
| 67 | 38, 66 | eqtrd 2264 |
. . . . 5
 

                           |
| 68 | 18 | ffvelcdmda 5782 |
. . . . . 6
 

      |
| 69 | | fvexg 5658 |
. . . . . . 7
                         |
| 70 | 62, 68, 69 | syl2anc 411 |
. . . . . 6
 

              |
| 71 | | fveq2 5639 |
. . . . . . 7
                   |
| 72 | | fveq1 5638 |
. . . . . . 7
                           |
| 73 | | fveq2 5639 |
. . . . . . . 8
           |
| 74 | | fveq1 5638 |
. . . . . . . 8
           |
| 75 | 73, 74 | cbvmpov 6101 |
. . . . . . 7
        
      |
| 76 | 71, 72, 75 | ovmpog 6156 |
. . . . . 6
                                                        |
| 77 | 68, 62, 70, 76 | syl3anc 1273 |
. . . . 5
 

       
                         |
| 78 | 67, 77 | eqtrd 2264 |
. . . 4
 

                    |
| 79 | 78 | ralrimiva 2605 |
. . 3
                      |
| 80 | | fvoveq1 6041 |
. . . . 5
               |
| 81 | | fveq2 5639 |
. . . . . 6
           |
| 82 | 54, 81 | fveq12d 5646 |
. . . . 5
                           |
| 83 | 80, 82 | eqeq12d 2246 |
. . . 4
                   
                     |
| 84 | 83 | cbvralvw 2771 |
. . 3
 
                                       |
| 85 | 79, 84 | sylibr 134 |
. 2
                      |
| 86 | 18, 29, 85 | 3jca 1203 |
1
              
                 |