| Step | Hyp | Ref
 | Expression | 
| 1 |   | nncdiv3 6278 | 
. 2
       Nn        Nn                                           1c                         2c    | 
| 2 |   | id 19 | 
. . . . . . 7
       Nn       Nn   | 
| 3 |   | nntccl 6171 | 
. . . . . . 7
       Nn   Tc     Nn   | 
| 4 |   | nnc3n3p1 6279 | 
. . . . . . 7
        Nn   Tc     Nn                      
    Tc     Tc   
  Tc   
 
1c   | 
| 5 | 2, 3, 4 | syl2anc 642 | 
. . . . . 6
       Nn                    
    Tc     Tc   
  Tc   
 
1c   | 
| 6 |   | nncaddccl 4420 | 
. . . . . . . . . . . 12
        Nn       Nn               Nn   | 
| 7 | 6 | anidms 626 | 
. . . . . . . . . . 11
       Nn            
Nn   | 
| 8 |   | nnnc 6147 | 
. . . . . . . . . . 11
             Nn            
NC   | 
| 9 | 7, 8 | syl 15 | 
. . . . . . . . . 10
       Nn            
NC   | 
| 10 |   | nnnc 6147 | 
. . . . . . . . . 10
       Nn       NC   | 
| 11 |   | tcdi 6165 | 
. . . . . . . . . 10
             
NC    
  NC     Tc                   Tc           Tc     | 
| 12 | 9, 10, 11 | syl2anc 642 | 
. . . . . . . . 9
       Nn   Tc                   Tc           Tc     | 
| 13 |   | tcdi 6165 | 
. . . . . . . . . . 11
        NC       NC     Tc   
      
  Tc     Tc     | 
| 14 | 10, 10, 13 | syl2anc 642 | 
. . . . . . . . . 10
       Nn   Tc             Tc     Tc     | 
| 15 | 14 | addceq1d 4390 | 
. . . . . . . . 9
       Nn     Tc           Tc         Tc     Tc      Tc     | 
| 16 | 12, 15 | eqtrd 2385 | 
. . . . . . . 8
       Nn   Tc                    Tc     Tc      Tc     | 
| 17 | 16 | addceq1d 4390 | 
. . . . . . 7
       Nn     Tc                 1c        Tc     Tc      Tc      1c   | 
| 18 | 17 | eqeq2d 2364 | 
. . . . . 6
       Nn                   
  Tc                 1c                        Tc     Tc      Tc      1c    | 
| 19 | 5, 18 | mtbird 292 | 
. . . . 5
       Nn                    
  Tc                 1c   | 
| 20 |   | id 19 | 
. . . . . . 7
                                          | 
| 21 |   | tceq 6159 | 
. . . . . . . 8
                       Tc     Tc                | 
| 22 | 21 | addceq1d 4390 | 
. . . . . . 7
                         Tc     1c      Tc                 1c   | 
| 23 | 20, 22 | eqeq12d 2367 | 
. . . . . 6
                              Tc     1c                      Tc                 1c    | 
| 24 | 23 | notbid 285 | 
. . . . 5
                               
Tc     1c                     
  Tc                 1c    | 
| 25 | 19, 24 | syl5ibrcom 213 | 
. . . 4
       Nn                                Tc     1c    | 
| 26 |   | nncaddccl 4420 | 
. . . . . . . . . . . 12
             
Nn    
  Nn                     Nn   | 
| 27 | 7, 2, 26 | syl2anc 642 | 
. . . . . . . . . . 11
       Nn           
      
Nn   | 
| 28 |   | nnnc 6147 | 
. . . . . . . . . . 11
                   Nn      
            NC   | 
| 29 | 27, 28 | syl 15 | 
. . . . . . . . . 10
       Nn           
      
NC   | 
| 30 |   | 1cnc 6140 | 
. . . . . . . . . 10
 
1c  
NC | 
| 31 |   | tcdi 6165 | 
. . . . . . . . . 10
            
      
NC   1c   NC     Tc                  1c     
Tc                 Tc 1c   | 
| 32 | 29, 30, 31 | sylancl 643 | 
. . . . . . . . 9
       Nn   Tc                  1c     
Tc                 Tc 1c   | 
| 33 |   | tc1c 6166 | 
. . . . . . . . . . 11
  Tc 1c   1c | 
| 34 | 33 | a1i 10 | 
. . . . . . . . . 10
       Nn   Tc
1c  
1c  | 
| 35 | 16, 34 | addceq12d 4392 | 
. . . . . . . . 9
       Nn     Tc                 Tc 1c        Tc     Tc      Tc      1c   | 
| 36 | 32, 35 | eqtrd 2385 | 
. . . . . . . 8
       Nn   Tc                  1c        Tc     Tc      Tc      1c   | 
| 37 | 36 | eqeq2d 2364 | 
. . . . . . 7
       Nn                   
Tc          
       1c                   
    Tc     Tc   
  Tc   
 
1c    | 
| 38 | 5, 37 | mtbird 292 | 
. . . . . 6
       Nn                    
Tc          
       1c   | 
| 39 |   | peano2 4404 | 
. . . . . . . . 9
                   Nn                    1c    Nn   | 
| 40 | 27, 39 | syl 15 | 
. . . . . . . 8
       Nn                    1c    Nn   | 
| 41 |   | nntccl 6171 | 
. . . . . . . 8
            
       1c    Nn   Tc          
       1c    Nn   | 
| 42 | 40, 41 | syl 15 | 
. . . . . . 7
       Nn   Tc                  1c    Nn   | 
| 43 |   | suc11nnc 4559 | 
. . . . . . 7
            
      
Nn   Tc                  1c    Nn                      
1c 
    Tc          
       1c   
1c 
 
             
  Tc          
       1c    | 
| 44 | 27, 42, 43 | syl2anc 642 | 
. . . . . 6
       Nn                    
1c 
    Tc          
       1c   
1c 
 
             
  Tc          
       1c    | 
| 45 | 38, 44 | mtbird 292 | 
. . . . 5
       Nn                     
1c 
    Tc          
       1c   
1c   | 
| 46 |   | id 19 | 
. . . . . . 7
                       
1c 
               
       1c   | 
| 47 |   | tceq 6159 | 
. . . . . . . 8
                       
1c 
  Tc    
Tc          
       1c   | 
| 48 | 47 | addceq1d 4390 | 
. . . . . . 7
                       
1c 
    Tc     1c      Tc          
       1c   
1c   | 
| 49 | 46, 48 | eqeq12d 2367 | 
. . . . . 6
                       
1c 
      
  Tc     1c                    
1c 
    Tc          
       1c   
1c    | 
| 50 | 49 | notbid 285 | 
. . . . 5
                       
1c 
           Tc     1c                       1c     
Tc          
       1c   
1c    | 
| 51 | 45, 50 | syl5ibrcom 213 | 
. . . 4
       Nn                 
       1c           
Tc     1c    | 
| 52 |   | peano2 4404 | 
. . . . . . . . 9
       Nn       
1c 
  Nn   | 
| 53 |   | nntccl 6171 | 
. . . . . . . . 9
       
1c 
  Nn   Tc     
1c 
  Nn   | 
| 54 | 52, 53 | syl 15 | 
. . . . . . . 8
       Nn   Tc      1c   
Nn   | 
| 55 |   | nnc3n3p2 6280 | 
. . . . . . . 8
     Tc      1c   
Nn    
  Nn          Tc      1c    Tc     
1c     Tc   
 
1c              
       2c   | 
| 56 | 54, 2, 55 | syl2anc 642 | 
. . . . . . 7
       Nn        Tc   
 
1c 
  Tc   
 
1c     Tc   
 
1c              
       2c   | 
| 57 |   | 2nnc 6168 | 
. . . . . . . . . . . . . 14
 
2c  
Nn | 
| 58 |   | nncaddccl 4420 | 
. . . . . . . . . . . . . 14
            
      
Nn   2c   Nn                      2c    Nn   | 
| 59 | 27, 57, 58 | sylancl 643 | 
. . . . . . . . . . . . 13
       Nn                    2c    Nn   | 
| 60 |   | nnnc 6147 | 
. . . . . . . . . . . . 13
            
       2c    Nn                   
2c 
  NC   | 
| 61 | 59, 60 | syl 15 | 
. . . . . . . . . . . 12
       Nn                    2c    NC   | 
| 62 |   | tcdi 6165 | 
. . . . . . . . . . . 12
                     2c    NC   1c   NC     Tc                   2c   
1c 
    Tc          
       2c    Tc 1c   | 
| 63 | 61, 30, 62 | sylancl 643 | 
. . . . . . . . . . 11
       Nn   Tc           
       2c   
1c 
    Tc          
       2c    Tc 1c   | 
| 64 | 63 | eqcomd 2358 | 
. . . . . . . . . 10
       Nn     Tc          
       2c    Tc 1c    Tc           
       2c   
1c   | 
| 65 | 33 | addceq2i 4388 | 
. . . . . . . . . 10
    Tc          
       2c    Tc 1c     
Tc          
       2c   
1c  | 
| 66 |   | addccom 4407 | 
. . . . . . . . . . . . . . . . 17
    1c   1c               1c  
1c   | 
| 67 |   | 1p1e2c 6156 | 
. . . . . . . . . . . . . . . . . 18
   1c  
1c 
 
2c | 
| 68 | 67 | addceq2i 4388 | 
. . . . . . . . . . . . . . . . 17
        1c   1c  
       2c  | 
| 69 | 66, 68 | eqtr2i 2374 | 
. . . . . . . . . . . . . . . 16
       2c   
  1c   1c       | 
| 70 | 69 | addceq1i 4387 | 
. . . . . . . . . . . . . . 15
       
2c 
 
1c 
     1c   1c         1c  | 
| 71 |   | addcass 4416 | 
. . . . . . . . . . . . . . 15
       
2c 
 
1c 
        2c   1c   | 
| 72 |   | addcass 4416 | 
. . . . . . . . . . . . . . 15
     1c   1c         1c      1c   1c         1c   | 
| 73 | 70, 71, 72 | 3eqtr3i 2381 | 
. . . . . . . . . . . . . 14
        2c   1c  
    1c   1c         1c   | 
| 74 | 73 | addceq2i 4388 | 
. . . . . . . . . . . . 13
                   2c   1c   
     
         1c  
1c 
       1c    | 
| 75 |   | addcass 4416 | 
. . . . . . . . . . . . 13
                    2c   1c  
     
             2c   1c    | 
| 76 |   | addcass 4416 | 
. . . . . . . . . . . . 13
               1c   1c  
       1c                  1c  
1c 
       1c    | 
| 77 | 74, 75, 76 | 3eqtr4i 2383 | 
. . . . . . . . . . . 12
                    2c   1c  
               1c   1c  
       1c   | 
| 78 |   | addcass 4416 | 
. . . . . . . . . . . 12
            
       2c   
1c 
                    2c   1c   | 
| 79 |   | addc4 4418 | 
. . . . . . . . . . . . 13
       
1c 
       1c                 1c   1c   | 
| 80 | 79 | addceq1i 4387 | 
. . . . . . . . . . . 12
        
1c 
       1c          1c              
   1c   1c          1c   | 
| 81 | 77, 78, 80 | 3eqtr4i 2383 | 
. . . . . . . . . . 11
            
       2c   
1c 
        
1c 
       1c          1c   | 
| 82 |   | tceq 6159 | 
. . . . . . . . . . 11
                     2c   
1c 
        
1c 
       1c          1c     Tc                   2c   
1c 
  Tc        1c        
1c          1c    | 
| 83 | 81, 82 | ax-mp 5 | 
. . . . . . . . . 10
  Tc                   2c   
1c 
  Tc        1c        
1c          1c   | 
| 84 | 64, 65, 83 | 3eqtr3g 2408 | 
. . . . . . . . 9
       Nn     Tc          
       2c   
1c 
  Tc        1c        
1c          1c    | 
| 85 |   | nnnc 6147 | 
. . . . . . . . . . . . 13
       
1c 
  Nn        1c    NC   | 
| 86 | 52, 85 | syl 15 | 
. . . . . . . . . . . 12
       Nn       
1c 
  NC   | 
| 87 |   | ncaddccl 6145 | 
. . . . . . . . . . . 12
        
1c 
  NC        1c    NC           1c        
1c     NC   | 
| 88 | 86, 86, 87 | syl2anc 642 | 
. . . . . . . . . . 11
       Nn         1c        
1c     NC   | 
| 89 |   | tcdi 6165 | 
. . . . . . . . . . 11
          1c        
1c     NC        1c    NC     Tc       
1c 
       1c          1c       Tc      
1c 
       1c     Tc   
 
1c    | 
| 90 | 88, 86, 89 | syl2anc 642 | 
. . . . . . . . . 10
       Nn   Tc       
1c 
       1c          1c       Tc      
1c 
       1c     Tc   
 
1c    | 
| 91 |   | tcdi 6165 | 
. . . . . . . . . . . 12
        
1c 
  NC        1c    NC     Tc      
1c 
       1c       Tc      1c    Tc     
1c    | 
| 92 | 86, 86, 91 | syl2anc 642 | 
. . . . . . . . . . 11
       Nn   Tc      
1c 
       1c       Tc      1c    Tc     
1c    | 
| 93 | 92 | addceq1d 4390 | 
. . . . . . . . . 10
       Nn     Tc      
1c 
       1c     Tc   
 
1c        Tc     
1c 
  Tc   
 
1c     Tc   
 
1c    | 
| 94 | 90, 93 | eqtrd 2385 | 
. . . . . . . . 9
       Nn   Tc       
1c 
       1c          1c        Tc     
1c 
  Tc   
 
1c     Tc   
 
1c    | 
| 95 | 84, 94 | eqtrd 2385 | 
. . . . . . . 8
       Nn     Tc          
       2c   
1c 
     Tc      1c    Tc     
1c     Tc   
 
1c    | 
| 96 | 95 | eqeq1d 2361 | 
. . . . . . 7
       Nn      Tc          
       2c   
1c 
                   2c      
Tc   
 
1c 
  Tc   
 
1c     Tc   
 
1c              
       2c    | 
| 97 | 56, 96 | mtbird 292 | 
. . . . . 6
       Nn       Tc          
       2c   
1c 
                   2c   | 
| 98 |   | eqcom 2355 | 
. . . . . 6
     Tc                  2c    1c   
    
            2c             
       2c      Tc          
       2c   
1c   | 
| 99 | 97, 98 | sylnib 295 | 
. . . . 5
       Nn                     
2c 
    Tc          
       2c   
1c   | 
| 100 |   | id 19 | 
. . . . . . 7
                       
2c 
               
       2c   | 
| 101 |   | tceq 6159 | 
. . . . . . . 8
                       
2c 
  Tc    
Tc          
       2c   | 
| 102 | 101 | addceq1d 4390 | 
. . . . . . 7
                       
2c 
    Tc     1c      Tc          
       2c   
1c   | 
| 103 | 100, 102 | eqeq12d 2367 | 
. . . . . 6
                       
2c 
      
  Tc     1c                    
2c 
    Tc          
       2c   
1c    | 
| 104 | 103 | notbid 285 | 
. . . . 5
                       
2c 
           Tc     1c                       2c     
Tc          
       2c   
1c    | 
| 105 | 99, 104 | syl5ibrcom 213 | 
. . . 4
       Nn                 
       2c           
Tc     1c    | 
| 106 | 25, 51, 105 | 3jaod 1246 | 
. . 3
       Nn                                              1c                         2c             Tc     1c    | 
| 107 | 106 | rexlimiv 2733 | 
. 2
       
Nn                                           1c                         2c             Tc     1c   | 
| 108 | 1, 107 | syl 15 | 
1
       Nn           Tc     1c   |