| Step | Hyp | Ref
| Expression |
| 1 | | fveq2 6191 |
. . . 4
                   |
| 2 | 1 | fveq2d 6195 |
. . 3
                           |
| 3 | | fveq2 6191 |
. . . 4
                   |
| 4 | 3 | oveq2d 6666 |
. . 3
                               |
| 5 | 2, 4 | breq12d 4666 |
. 2
             
         
           
                 |
| 6 | | fveq2 6191 |
. . . . . . . . . 10
           |
| 7 | 6 | fveq2d 6195 |
. . . . . . . . 9
                   |
| 8 | | fveq2 6191 |
. . . . . . . . . 10
           |
| 9 | 8 | oveq2d 6666 |
. . . . . . . . 9
               |
| 10 | 7, 9 | breq12d 4666 |
. . . . . . . 8
         
     
                 |
| 11 | 10 | rspcv 3305 |
. . . . . . 7
  
                               |
| 12 | 11 | ad3antlr 767 |
. . . . . 6
     NGHom  
          
                               |
| 13 | | nmofval.1 |
. . . . . . . . . . . . . 14
     |
| 14 | 13 | isnghm 22527 |
. . . . . . . . . . . . 13
  NGHom    NrmGrp NrmGrp            |
| 15 | 14 | simplbi 476 |
. . . . . . . . . . . 12
  NGHom 
 NrmGrp NrmGrp  |
| 16 | 15 | adantr 481 |
. . . . . . . . . . 11
   NGHom   
NrmGrp NrmGrp  |
| 17 | 16 | simprd 479 |
. . . . . . . . . 10
   NGHom   NrmGrp |
| 18 | 14 | simprbi 480 |
. . . . . . . . . . . . . 14
  NGHom 
          |
| 19 | 18 | adantr 481 |
. . . . . . . . . . . . 13
   NGHom   
         |
| 20 | 19 | simpld 475 |
. . . . . . . . . . . 12
   NGHom       |
| 21 | | nmoi.2 |
. . . . . . . . . . . . 13
     |
| 22 | | eqid 2622 |
. . . . . . . . . . . . 13
         |
| 23 | 21, 22 | ghmf 17664 |
. . . . . . . . . . . 12
  
          |
| 24 | 20, 23 | syl 17 |
. . . . . . . . . . 11
   NGHom             |
| 25 | | ffvelrn 6357 |
. . . . . . . . . . 11
                     |
| 26 | 24, 25 | sylancom 701 |
. . . . . . . . . 10
   NGHom             |
| 27 | | nmoi.4 |
. . . . . . . . . . 11
     |
| 28 | 22, 27 | nmcl 22420 |
. . . . . . . . . 10
  NrmGrp
                   |
| 29 | 17, 26, 28 | syl2anc 693 |
. . . . . . . . 9
   NGHom             |
| 30 | 29 | adantr 481 |
. . . . . . . 8
    NGHom 

               |
| 31 | 30 | adantr 481 |
. . . . . . 7
     NGHom  
                   |
| 32 | | elrege0 12278 |
. . . . . . . . 9
   
    |
| 33 | 32 | simplbi 476 |
. . . . . . . 8
   
  |
| 34 | 33 | adantl 482 |
. . . . . . 7
     NGHom  
           |
| 35 | 16 | simpld 475 |
. . . . . . . . . . 11
   NGHom   NrmGrp |
| 36 | | simpr 477 |
. . . . . . . . . . 11
   NGHom     |
| 37 | 35, 36 | jca 554 |
. . . . . . . . . 10
   NGHom   
NrmGrp    |
| 38 | | nmoi.3 |
. . . . . . . . . . . 12
     |
| 39 | | eqid 2622 |
. . . . . . . . . . . 12
         |
| 40 | 21, 38, 39 | nmrpcl 22424 |
. . . . . . . . . . 11
  NrmGrp
           |
| 41 | 40 | 3expa 1265 |
. . . . . . . . . 10
   NrmGrp             |
| 42 | 37, 41 | sylan 488 |
. . . . . . . . 9
    NGHom 

           |
| 43 | 42 | rpregt0d 11878 |
. . . . . . . 8
    NGHom 

                 |
| 44 | 43 | adantr 481 |
. . . . . . 7
     NGHom  
                     |
| 45 | | ledivmul2 10902 |
. . . . . . 7
         
                                 
         |
| 46 | 31, 34, 44, 45 | syl3anc 1326 |
. . . . . 6
     NGHom  
                       
                 |
| 47 | 12, 46 | sylibrd 249 |
. . . . 5
     NGHom  
          
                               |
| 48 | 47 | ralrimiva 2966 |
. . . 4
    NGHom 

                   
                       |
| 49 | 35 | adantr 481 |
. . . . 5
    NGHom 

     NrmGrp |
| 50 | 17 | adantr 481 |
. . . . 5
    NGHom 

     NrmGrp |
| 51 | 20 | adantr 481 |
. . . . 5
    NGHom 

         |
| 52 | 30, 42 | rerpdivcld 11903 |
. . . . . 6
    NGHom 

                     |
| 53 | 52 | rexrd 10089 |
. . . . 5
    NGHom 

                     |
| 54 | 13, 21, 38, 27 | nmogelb 22520 |
. . . . 5
   NrmGrp NrmGrp                                                    
                        |
| 55 | 49, 50, 51, 53, 54 | syl31anc 1329 |
. . . 4
    NGHom 

                                      
                        |
| 56 | 48, 55 | mpbird 247 |
. . 3
    NGHom 

                         |
| 57 | 19 | simprd 479 |
. . . . 5
   NGHom         |
| 58 | 57 | adantr 481 |
. . . 4
    NGHom 

           |
| 59 | 30, 58, 42 | ledivmul2d 11926 |
. . 3
    NGHom 

                               
             |
| 60 | 56, 59 | mpbid 222 |
. 2
    NGHom 

            
            |
| 61 | | eqid 2622 |
. . . . . . 7
         |
| 62 | 39, 61 | ghmid 17666 |
. . . . . 6
  
              |
| 63 | 20, 62 | syl 17 |
. . . . 5
   NGHom                 |
| 64 | 63 | fveq2d 6195 |
. . . 4
   NGHom                         |
| 65 | 27, 61 | nm0 22433 |
. . . . 5
 NrmGrp           |
| 66 | 17, 65 | syl 17 |
. . . 4
   NGHom             |
| 67 | 64, 66 | eqtrd 2656 |
. . 3
   NGHom                 |
| 68 | 38, 39 | nm0 22433 |
. . . . . 6
 NrmGrp           |
| 69 | 35, 68 | syl 17 |
. . . . 5
   NGHom             |
| 70 | | 0re 10040 |
. . . . 5
 |
| 71 | 69, 70 | syl6eqel 2709 |
. . . 4
   NGHom             |
| 72 | 13 | nmoge0 22525 |
. . . . 5
  NrmGrp
NrmGrp
         |
| 73 | 35, 17, 20, 72 | syl3anc 1326 |
. . . 4
   NGHom         |
| 74 | | 0le0 11110 |
. . . . 5
 |
| 75 | 74, 69 | syl5breqr 4691 |
. . . 4
   NGHom             |
| 76 | 57, 71, 73, 75 | mulge0d 10604 |
. . 3
   NGHom                   |
| 77 | 67, 76 | eqbrtrd 4675 |
. 2
   NGHom                               |
| 78 | 5, 60, 77 | pm2.61ne 2879 |
1
   NGHom                       |