| Step | Hyp | Ref
| Expression |
| 1 | | nmotri.1 |
. 2
     |
| 2 | | eqid 2622 |
. 2
         |
| 3 | | eqid 2622 |
. 2
         |
| 4 | | eqid 2622 |
. 2
         |
| 5 | | eqid 2622 |
. 2
         |
| 6 | | nghmrcl1 22536 |
. . 3
  NGHom 
NrmGrp |
| 7 | 6 | 3ad2ant2 1083 |
. 2
   NGHom   NGHom   NrmGrp |
| 8 | | nghmrcl2 22537 |
. . 3
  NGHom 
NrmGrp |
| 9 | 8 | 3ad2ant2 1083 |
. 2
   NGHom   NGHom   NrmGrp |
| 10 | | id 22 |
. . 3

  |
| 11 | | nghmghm 22538 |
. . 3
  NGHom 

   |
| 12 | | nghmghm 22538 |
. . 3
  NGHom 

   |
| 13 | | nmotri.p |
. . . 4
    |
| 14 | 13 | ghmplusg 18249 |
. . 3
              |
| 15 | 10, 11, 12, 14 | syl3an 1368 |
. 2
   NGHom   NGHom          |
| 16 | 1 | nghmcl 22531 |
. . . 4
  NGHom 
      |
| 17 | 16 | 3ad2ant2 1083 |
. . 3
   NGHom   NGHom         |
| 18 | 1 | nghmcl 22531 |
. . . 4
  NGHom 
      |
| 19 | 18 | 3ad2ant3 1084 |
. . 3
   NGHom   NGHom         |
| 20 | 17, 19 | readdcld 10069 |
. 2
   NGHom   NGHom               |
| 21 | 11 | 3ad2ant2 1083 |
. . . 4
   NGHom   NGHom       |
| 22 | 1 | nmoge0 22525 |
. . . 4
  NrmGrp
NrmGrp
         |
| 23 | 7, 9, 21, 22 | syl3anc 1326 |
. . 3
   NGHom   NGHom         |
| 24 | 12 | 3ad2ant3 1084 |
. . . 4
   NGHom   NGHom       |
| 25 | 1 | nmoge0 22525 |
. . . 4
  NrmGrp
NrmGrp
         |
| 26 | 7, 9, 24, 25 | syl3anc 1326 |
. . 3
   NGHom   NGHom         |
| 27 | 17, 19, 23, 26 | addge0d 10603 |
. 2
   NGHom   NGHom               |
| 28 | 9 | adantr 481 |
. . . . 5
    NGHom   NGHom       
      NrmGrp |
| 29 | | ngpgrp 22403 |
. . . . . . 7
 NrmGrp   |
| 30 | 28, 29 | syl 17 |
. . . . . 6
    NGHom   NGHom       
        |
| 31 | 21 | adantr 481 |
. . . . . . . 8
    NGHom   NGHom       
          |
| 32 | | eqid 2622 |
. . . . . . . . 9
         |
| 33 | 2, 32 | ghmf 17664 |
. . . . . . . 8
  
              |
| 34 | 31, 33 | syl 17 |
. . . . . . 7
    NGHom   NGHom       
                    |
| 35 | | simprl 794 |
. . . . . . 7
    NGHom   NGHom       
            |
| 36 | 34, 35 | ffvelrnd 6360 |
. . . . . 6
    NGHom   NGHom       
                |
| 37 | 24 | adantr 481 |
. . . . . . . 8
    NGHom   NGHom       
          |
| 38 | 2, 32 | ghmf 17664 |
. . . . . . . 8
  
              |
| 39 | 37, 38 | syl 17 |
. . . . . . 7
    NGHom   NGHom       
                    |
| 40 | 39, 35 | ffvelrnd 6360 |
. . . . . 6
    NGHom   NGHom       
                |
| 41 | 32, 13 | grpcl 17430 |
. . . . . 6
         
        
                |
| 42 | 30, 36, 40, 41 | syl3anc 1326 |
. . . . 5
    NGHom   NGHom       
          
           |
| 43 | 32, 4 | nmcl 22420 |
. . . . 5
  NrmGrp
    
                              |
| 44 | 28, 42, 43 | syl2anc 693 |
. . . 4
    NGHom   NGHom       
                          |
| 45 | 32, 4 | nmcl 22420 |
. . . . . 6
  NrmGrp
                       |
| 46 | 28, 36, 45 | syl2anc 693 |
. . . . 5
    NGHom   NGHom       
                    |
| 47 | 32, 4 | nmcl 22420 |
. . . . . 6
  NrmGrp
                       |
| 48 | 28, 40, 47 | syl2anc 693 |
. . . . 5
    NGHom   NGHom       
                    |
| 49 | 46, 48 | readdcld 10069 |
. . . 4
    NGHom   NGHom       
                                  |
| 50 | 17 | adantr 481 |
. . . . . 6
    NGHom   NGHom       
            |
| 51 | | simpl 473 |
. . . . . . 7
                 |
| 52 | 2, 3 | nmcl 22420 |
. . . . . . 7
  NrmGrp
               |
| 53 | 7, 51, 52 | syl2an 494 |
. . . . . 6
    NGHom   NGHom       
                |
| 54 | 50, 53 | remulcld 10070 |
. . . . 5
    NGHom   NGHom       
                      |
| 55 | 19 | adantr 481 |
. . . . . 6
    NGHom   NGHom       
            |
| 56 | 55, 53 | remulcld 10070 |
. . . . 5
    NGHom   NGHom       
                      |
| 57 | 54, 56 | readdcld 10069 |
. . . 4
    NGHom   NGHom       
                                      |
| 58 | 32, 4, 13 | nmtri 22430 |
. . . . 5
  NrmGrp
       
        
                                              |
| 59 | 28, 36, 40, 58 | syl3anc 1326 |
. . . 4
    NGHom   NGHom       
                                                    |
| 60 | | simpl2 1065 |
. . . . . 6
    NGHom   NGHom       
       NGHom    |
| 61 | 1, 2, 3, 4 | nmoi 22532 |
. . . . . 6
   NGHom                                   |
| 62 | 60, 35, 61 | syl2anc 693 |
. . . . 5
    NGHom   NGHom       
                                  |
| 63 | | simpl3 1066 |
. . . . . 6
    NGHom   NGHom       
       NGHom    |
| 64 | 1, 2, 3, 4 | nmoi 22532 |
. . . . . 6
   NGHom                                   |
| 65 | 63, 35, 64 | syl2anc 693 |
. . . . 5
    NGHom   NGHom       
                                  |
| 66 | 46, 48, 54, 56, 62, 65 | le2addd 10646 |
. . . 4
    NGHom   NGHom       
                                                                |
| 67 | 44, 49, 57, 59, 66 | letrd 10194 |
. . 3
    NGHom   NGHom       
                                                        |
| 68 | | ffn 6045 |
. . . . . 6
            
      |
| 69 | 34, 68 | syl 17 |
. . . . 5
    NGHom   NGHom       
            |
| 70 | | ffn 6045 |
. . . . . 6
            
      |
| 71 | 39, 70 | syl 17 |
. . . . 5
    NGHom   NGHom       
            |
| 72 | | fvexd 6203 |
. . . . 5
    NGHom   NGHom       
            |
| 73 | | fnfvof 6911 |
. . . . 5
      
         
                         |
| 74 | 69, 71, 72, 35, 73 | syl22anc 1327 |
. . . 4
    NGHom   NGHom       
                 
       |
| 75 | 74 | fveq2d 6195 |
. . 3
    NGHom   NGHom       
                                         |
| 76 | 50 | recnd 10068 |
. . . 4
    NGHom   NGHom       
            |
| 77 | 55 | recnd 10068 |
. . . 4
    NGHom   NGHom       
            |
| 78 | 53 | recnd 10068 |
. . . 4
    NGHom   NGHom       
                |
| 79 | 76, 77, 78 | adddird 10065 |
. . 3
    NGHom   NGHom       
                                                          |
| 80 | 67, 75, 79 | 3brtr4d 4685 |
. 2
    NGHom   NGHom       
                                           |
| 81 | 1, 2, 3, 4, 5, 7, 9, 15, 20, 27, 80 | nmolb2d 22522 |
1
   NGHom   NGHom      
               |