| Step | Hyp | Ref
 | Expression | 
| 1 |   | nnltp1c 6263 | 
. . . . . . . . . . . 12
       Nn      c     
1c   | 
| 2 |   | nnnc 6147 | 
. . . . . . . . . . . . 13
       Nn       NC   | 
| 3 |   | peano2 4404 | 
. . . . . . . . . . . . . 14
       Nn       
1c 
  Nn   | 
| 4 |   | nnnc 6147 | 
. . . . . . . . . . . . . 14
       
1c 
  Nn        1c    NC   | 
| 5 | 3, 4 | syl 15 | 
. . . . . . . . . . . . 13
       Nn       
1c 
  NC   | 
| 6 |   | ltlenlec 6208 | 
. . . . . . . . . . . . 13
        NC        1c    NC         c      1c        c      1c           1c   c      | 
| 7 | 2, 5, 6 | syl2anc 642 | 
. . . . . . . . . . . 12
       Nn       c      1c        c      1c           1c   c      | 
| 8 | 1, 7 | mpbid 201 | 
. . . . . . . . . . 11
       Nn       c      1c           1c   c     | 
| 9 | 8 | simprd 449 | 
. . . . . . . . . 10
       Nn          1c   c    | 
| 10 | 9 | adantr 451 | 
. . . . . . . . 9
        Nn       Nn            1c   c    | 
| 11 | 10 | intnand 882 | 
. . . . . . . 8
        Nn       Nn        1c  c     
1c 
       1c   c     | 
| 12 | 11 | a1d 22 | 
. . . . . . 7
        Nn       Nn          
1c 
  Nn      1c  c      1c         1c   c      | 
| 13 |   | breq2 4644 | 
. . . . . . . . . . 11
            1c     1c  c     1c  c   
 
1c    | 
| 14 |   | breq1 4643 | 
. . . . . . . . . . 11
            1c        c          1c   c     | 
| 15 | 13, 14 | anbi12d 691 | 
. . . . . . . . . 10
            1c      1c  c        c       1c  c     
1c 
       1c   c      | 
| 16 | 15 | elrab 2995 | 
. . . . . . . . 9
       
1c 
       Nn    1c  c        c             1c   
Nn    1c  c     
1c 
       1c   c      | 
| 17 | 16 | notbii 287 | 
. . . . . . . 8
         
1c 
       Nn    1c  c        c              
1c 
  Nn    1c  c     
1c 
       1c   c      | 
| 18 |   | imnan 411 | 
. . . . . . . 8
        
1c 
  Nn      1c  c      1c         1c   c            
 
1c 
  Nn    1c  c     
1c 
       1c   c      | 
| 19 | 17, 18 | bitr4i 243 | 
. . . . . . 7
         
1c 
       Nn    1c  c        c             1c   
Nn      1c  c     
1c 
       1c   c      | 
| 20 | 12, 19 | sylibr 203 | 
. . . . . 6
        Nn       Nn            1c         Nn    1c  c        c      | 
| 21 | 3 | adantr 451 | 
. . . . . . 7
        Nn       Nn          1c   
Nn   | 
| 22 |   | elcomplg 3219 | 
. . . . . . 7
       
1c 
  Nn         1c   
∼      Nn    1c  c      
 c              1c   
     Nn    1c  c        c       | 
| 23 | 21, 22 | syl 15 | 
. . . . . 6
        Nn       Nn          
1c 
  ∼      Nn    1c  c        c              1c   
     Nn    1c  c        c       | 
| 24 | 20, 23 | mpbird 223 | 
. . . . 5
        Nn       Nn          1c   
∼      Nn    1c  c      
 c      | 
| 25 |   | nnnc 6147 | 
. . . . . . . . . . . . . 14
       Nn       NC   | 
| 26 |   | ncslesuc 6268 | 
. . . . . . . . . . . . . 14
        NC       NC         c     
1c 
 
    c             
1c     | 
| 27 | 25, 2, 26 | syl2an 463 | 
. . . . . . . . . . . . 13
        Nn       Nn         c     
1c 
 
    c             
1c     | 
| 28 | 27 | expcom 424 | 
. . . . . . . . . . . 12
       Nn        Nn       c     
1c 
 
    c             
1c      | 
| 29 | 28 | adantrd 454 | 
. . . . . . . . . . 11
       Nn         Nn   1c
 c          c      1c        c        
     1c      | 
| 30 | 29 | adantr 451 | 
. . . . . . . . . 10
        Nn       Nn           Nn   1c  c   
      c     
1c 
 
    c             
1c      | 
| 31 | 30 | pm5.32d 620 | 
. . . . . . . . 9
        Nn       Nn            Nn   1c  c   
     c   
 
1c           Nn   1c  c   
      c             
1c      | 
| 32 |   | anass 630 | 
. . . . . . . . 9
         Nn   1c  c   
     c   
 
1c          Nn    1c  c        c     
1c     | 
| 33 |   | andi 837 | 
. . . . . . . . . 10
         Nn   1c  c   
      c             
1c             Nn   1c  c   
     c   
     
  Nn   1c  c   
          
1c     | 
| 34 |   | anass 630 | 
. . . . . . . . . . 11
         Nn   1c  c   
     c   
 
     Nn    1c  c        c      | 
| 35 | 34 | orbi1i 506 | 
. . . . . . . . . 10
          Nn   1c
 c       
 c            Nn   1c  c              
1c            Nn    1c  c        c          
  Nn   1c  c   
          
1c     | 
| 36 | 33, 35 | bitri 240 | 
. . . . . . . . 9
         Nn   1c  c   
      c             
1c            Nn    1c  c        c          
  Nn   1c  c   
          
1c     | 
| 37 | 31, 32, 36 | 3bitr3g 278 | 
. . . . . . . 8
        Nn       Nn           Nn    1c  c        c     
1c            Nn    1c  c        c          
  Nn   1c  c   
          
1c      | 
| 38 |   | 1cnc 6140 | 
. . . . . . . . . . . . . . . 16
 
1c  
NC | 
| 39 |   | addlecncs 6210 | 
. . . . . . . . . . . . . . . 16
    1c   NC       NC     1c  c  1c       | 
| 40 | 38, 2, 39 | sylancr 644 | 
. . . . . . . . . . . . . . 15
       Nn   1c  c  1c       | 
| 41 |   | addccom 4407 | 
. . . . . . . . . . . . . . 15
       1c   
 1c
     | 
| 42 | 40, 41 | syl6breqr 4680 | 
. . . . . . . . . . . . . 14
       Nn   1c  c     
1c   | 
| 43 | 3, 42 | jca 518 | 
. . . . . . . . . . . . 13
       Nn         1c    Nn   1c  c     
1c    | 
| 44 |   | eleq1 2413 | 
. . . . . . . . . . . . . 14
            1c         Nn       
1c 
  Nn    | 
| 45 |   | breq2 4644 | 
. . . . . . . . . . . . . 14
            1c     1c  c     1c  c   
 
1c    | 
| 46 | 44, 45 | anbi12d 691 | 
. . . . . . . . . . . . 13
            1c          Nn   1c
 c            1c    Nn   1c  c     
1c     | 
| 47 | 43, 46 | syl5ibrcom 213 | 
. . . . . . . . . . . 12
       Nn            
1c 
      
Nn   1c  c      | 
| 48 | 47 | adantr 451 | 
. . . . . . . . . . 11
        Nn       Nn               1c         Nn   1c  c      | 
| 49 | 48 | pm4.71rd 616 | 
. . . . . . . . . 10
        Nn       Nn               1c          Nn   1c  c   
          
1c     | 
| 50 | 49 | bicomd 192 | 
. . . . . . . . 9
        Nn       Nn            Nn   1c  c   
          
1c             
1c    | 
| 51 | 50 | orbi2d 682 | 
. . . . . . . 8
        Nn       Nn            Nn    1c  c        c          
  Nn   1c  c   
          
1c            Nn    1c  c        c               
1c     | 
| 52 | 37, 51 | bitrd 244 | 
. . . . . . 7
        Nn       Nn           Nn    1c  c        c     
1c            Nn    1c  c        c               
1c     | 
| 53 |   | breq2 4644 | 
. . . . . . . . 9
            1c  c     1c  c     | 
| 54 |   | breq1 4643 | 
. . . . . . . . 9
               c     
1c 
 
   c     
1c    | 
| 55 | 53, 54 | anbi12d 691 | 
. . . . . . . 8
             1c  c        c      1c  
 
 1c
 c        c     
1c     | 
| 56 | 55 | elrab 2995 | 
. . . . . . 7
            Nn    1c  c      
 c      1c           Nn    1c  c        c     
1c     | 
| 57 |   | elun 3221 | 
. . . . . . . 8
             Nn    1c  c        c             1c                Nn    1c  c      
 c                
1c     | 
| 58 |   | breq1 4643 | 
. . . . . . . . . . 11
               c        c     | 
| 59 | 53, 58 | anbi12d 691 | 
. . . . . . . . . 10
             1c  c        c       1c  c        c      | 
| 60 | 59 | elrab 2995 | 
. . . . . . . . 9
            Nn    1c  c      
 c            Nn    1c  c      
 c      | 
| 61 |   | elsn 3749 | 
. . . . . . . . 9
             1c             
1c   | 
| 62 | 60, 61 | orbi12i 507 | 
. . . . . . . 8
             Nn    1c  c        c                
1c            Nn    1c  c        c               
1c    | 
| 63 | 57, 62 | bitri 240 | 
. . . . . . 7
             Nn    1c  c        c             1c            Nn    1c  c        c               
1c    | 
| 64 | 52, 56, 63 | 3bitr4g 279 | 
. . . . . 6
        Nn       Nn               Nn    1c  c      
 c      1c                Nn    1c  c      
 c             1c      | 
| 65 | 64 | eqrdv 2351 | 
. . . . 5
        Nn       Nn          Nn    1c  c        c      1c            Nn    1c  c        c          
 
1c     | 
| 66 |   | sneq 3745 | 
. . . . . . . 8
            1c               
1c    | 
| 67 | 66 | uneq2d 3419 | 
. . . . . . 7
            1c          Nn    1c  c      
 c           
     
  Nn    1c  c        c          
 
1c     | 
| 68 | 67 | eqeq2d 2364 | 
. . . . . 6
            1c          Nn    1c  c      
 c      1c            Nn    1c  c        c                   Nn    1c  c        c      1c            Nn    1c  c        c          
 
1c      | 
| 69 | 68 | rspcev 2956 | 
. . . . 5
        
1c 
  ∼      Nn    1c  c        c            Nn    1c  c        c      1c            Nn    1c  c        c          
 
1c            ∼      Nn    1c  c        c          Nn    1c  c      
 c      1c            Nn    1c  c        c             | 
| 70 | 24, 65, 69 | syl2anc 642 | 
. . . 4
        Nn       Nn          ∼      Nn    1c  c        c          Nn    1c  c        c      1c            Nn    1c  c        c             | 
| 71 |   | compleq 3244 | 
. . . . . 6
            Nn    1c  c      
 c       ∼
    ∼      Nn    1c  c        c      | 
| 72 |   | uneq1 3412 | 
. . . . . . 7
            Nn    1c  c      
 c                  
     
Nn    1c  c        c             | 
| 73 | 72 | eqeq2d 2364 | 
. . . . . 6
            Nn    1c  c      
 c            
Nn    1c  c        c     
1c        
      
 
     Nn    1c  c        c      1c            Nn    1c  c        c              | 
| 74 | 71, 73 | rexeqbidv 2821 | 
. . . . 5
            Nn    1c  c      
 c            
∼       Nn    1c  c        c      1c               
 
     ∼      Nn    1c  c        c          Nn    1c  c        c      1c            Nn    1c  c        c              | 
| 75 | 74 | rspcev 2956 | 
. . . 4
         Nn    1c  c        c                ∼      Nn    1c  c        c          Nn    1c  c      
 c      1c            Nn    1c  c        c                 
      
  ∼      
Nn    1c  c        c     
1c        
        | 
| 76 | 70, 75 | sylan2 460 | 
. . 3
         Nn    1c  c        c                Nn       Nn          
       ∼       Nn    1c  c      
 c      1c                 | 
| 77 |   | elsuc 4414 | 
. . 3
       
Nn    1c  c        c     
1c        
 
1c 
 
            ∼       Nn    1c  c        c     
1c        
        | 
| 78 | 76, 77 | sylibr 203 | 
. 2
         Nn    1c  c        c                Nn       Nn          
Nn    1c  c        c     
1c        
 
1c   | 
| 79 | 78 | expcom 424 | 
1
        Nn       Nn          
Nn    1c  c        c                Nn    1c  c        c     
1c        
 
1c    |