| Step | Hyp | Ref
| Expression |
| 1 | | nmoco.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 | adantl 482 |
. 2
   NGHom   NGHom  
NrmGrp |
| 8 | | nghmrcl2 22537 |
. . 3
  NGHom 
NrmGrp |
| 9 | 8 | adantr 481 |
. 2
   NGHom   NGHom  
NrmGrp |
| 10 | | nghmghm 22538 |
. . 3
  NGHom 

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

   |
| 12 | | ghmco 17680 |
. . 3
      
      |
| 13 | 10, 11, 12 | syl2an 494 |
. 2
   NGHom   NGHom  
      |
| 14 | | nmoco.2 |
. . . 4
     |
| 15 | 14 | nghmcl 22531 |
. . 3
  NGHom 
      |
| 16 | | nmoco.3 |
. . . 4
     |
| 17 | 16 | nghmcl 22531 |
. . 3
  NGHom 
      |
| 18 | | remulcl 10021 |
. . 3
                       |
| 19 | 15, 17, 18 | syl2an 494 |
. 2
   NGHom   NGHom  
            |
| 20 | | nghmrcl1 22536 |
. . . . 5
  NGHom 
NrmGrp |
| 21 | 14 | nmoge0 22525 |
. . . . 5
  NrmGrp
NrmGrp
         |
| 22 | 20, 8, 10, 21 | syl3anc 1326 |
. . . 4
  NGHom 
      |
| 23 | 15, 22 | jca 554 |
. . 3
  NGHom 
            |
| 24 | | nghmrcl2 22537 |
. . . . 5
  NGHom 
NrmGrp |
| 25 | 16 | nmoge0 22525 |
. . . . 5
  NrmGrp
NrmGrp
         |
| 26 | 6, 24, 11, 25 | syl3anc 1326 |
. . . 4
  NGHom 
      |
| 27 | 17, 26 | jca 554 |
. . 3
  NGHom 
            |
| 28 | | mulge0 10546 |
. . 3
      
         
                  |
| 29 | 23, 27, 28 | syl2an 494 |
. 2
   NGHom   NGHom  
            |
| 30 | 8 | ad2antrr 762 |
. . . . 5
    NGHom 
 NGHom             
NrmGrp |
| 31 | 10 | ad2antrr 762 |
. . . . . . 7
    NGHom 
 NGHom             
    |
| 32 | | eqid 2622 |
. . . . . . . 8
         |
| 33 | | eqid 2622 |
. . . . . . . 8
         |
| 34 | 32, 33 | ghmf 17664 |
. . . . . . 7
  
              |
| 35 | 31, 34 | syl 17 |
. . . . . 6
    NGHom 
 NGHom                            |
| 36 | 11 | ad2antlr 763 |
. . . . . . . 8
    NGHom 
 NGHom             
    |
| 37 | 2, 32 | ghmf 17664 |
. . . . . . . 8
  
              |
| 38 | 36, 37 | syl 17 |
. . . . . . 7
    NGHom 
 NGHom                            |
| 39 | | simprl 794 |
. . . . . . 7
    NGHom 
 NGHom             
      |
| 40 | 38, 39 | ffvelrnd 6360 |
. . . . . 6
    NGHom 
 NGHom                        |
| 41 | 35, 40 | ffvelrnd 6360 |
. . . . 5
    NGHom 
 NGHom                            |
| 42 | 33, 4 | nmcl 22420 |
. . . . 5
  NrmGrp
                               |
| 43 | 30, 41, 42 | syl2anc 693 |
. . . 4
    NGHom 
 NGHom                                |
| 44 | 15 | ad2antrr 762 |
. . . . 5
    NGHom 
 NGHom                    |
| 45 | 20 | ad2antrr 762 |
. . . . . 6
    NGHom 
 NGHom             
NrmGrp |
| 46 | | eqid 2622 |
. . . . . . 7
         |
| 47 | 32, 46 | nmcl 22420 |
. . . . . 6
  NrmGrp
                       |
| 48 | 45, 40, 47 | syl2anc 693 |
. . . . 5
    NGHom 
 NGHom                            |
| 49 | 44, 48 | remulcld 10070 |
. . . 4
    NGHom 
 NGHom                                  |
| 50 | 17 | ad2antlr 763 |
. . . . . 6
    NGHom 
 NGHom                    |
| 51 | 2, 3 | nmcl 22420 |
. . . . . . . 8
  NrmGrp
               |
| 52 | 6, 51 | sylan 488 |
. . . . . . 7
   NGHom                 |
| 53 | 52 | ad2ant2lr 784 |
. . . . . 6
    NGHom 
 NGHom                        |
| 54 | 50, 53 | remulcld 10070 |
. . . . 5
    NGHom 
 NGHom                              |
| 55 | 44, 54 | remulcld 10070 |
. . . 4
    NGHom 
 NGHom                                    |
| 56 | | simpll 790 |
. . . . 5
    NGHom 
 NGHom             
 NGHom    |
| 57 | 14, 32, 46, 4 | nmoi 22532 |
. . . . 5
   NGHom                                               |
| 58 | 56, 40, 57 | syl2anc 693 |
. . . 4
    NGHom 
 NGHom                                                  |
| 59 | 23 | ad2antrr 762 |
. . . . 5
    NGHom 
 NGHom                  
       |
| 60 | 16, 2, 3, 46 | nmoi 22532 |
. . . . . 6
   NGHom                                   |
| 61 | 60 | ad2ant2lr 784 |
. . . . 5
    NGHom 
 NGHom                                          |
| 62 | | lemul2a 10878 |
. . . . 5
                                                                                                           |
| 63 | 48, 54, 59, 61, 62 | syl31anc 1329 |
. . . 4
    NGHom 
 NGHom                                                      |
| 64 | 43, 49, 55, 58, 63 | letrd 10194 |
. . 3
    NGHom 
 NGHom                                                    |
| 65 | | fvco3 6275 |
. . . . 5
                                   |
| 66 | 38, 39, 65 | syl2anc 693 |
. . . 4
    NGHom 
 NGHom                              |
| 67 | 66 | fveq2d 6195 |
. . 3
    NGHom 
 NGHom                      
                       |
| 68 | 44 | recnd 10068 |
. . . 4
    NGHom 
 NGHom                    |
| 69 | 50 | recnd 10068 |
. . . 4
    NGHom 
 NGHom                    |
| 70 | 53 | recnd 10068 |
. . . 4
    NGHom 
 NGHom                        |
| 71 | 68, 69, 70 | mulassd 10063 |
. . 3
    NGHom 
 NGHom                                                        |
| 72 | 64, 67, 71 | 3brtr4d 4685 |
. 2
    NGHom 
 NGHom                      
                           |
| 73 | 1, 2, 3, 4, 5, 7, 9, 13, 19, 29, 72 | nmolb2d 22522 |
1
   NGHom   NGHom  
                  |