| Step | Hyp | Ref
| Expression |
| 1 | | df-rhm 13708 |
. 2
RingHom  
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                                                     |
| 2 | | ancom 266 |
. . . . . . 7
              
                                                                   
 
                                                                                  |
| 3 | | r19.26-2 2626 |
. . . . . . . 8
 
                                                                                                                                                     |
| 4 | 3 | anbi1i 458 |
. . . . . . 7
        
                                                                         
  
     
                                                                                       |
| 5 | | anass 401 |
. . . . . . 7
                                                                                              
 
                                            
                                                 |
| 6 | 2, 4, 5 | 3bitri 206 |
. . . . . 6
              
                                                                   
 
                                            
                                                 |
| 7 | 6 | rabbii 2749 |
. . . . 5
                       
                                                                           
                                                   
                                                 |
| 8 | | basfn 12736 |
. . . . . . 7
 |
| 9 | | vex 2766 |
. . . . . . 7
 |
| 10 | | funfvex 5575 |
. . . . . . . 8
 
       |
| 11 | 10 | funfni 5358 |
. . . . . . 7
 
       |
| 12 | 8, 9, 11 | mp2an 426 |
. . . . . 6
     |
| 13 | | vex 2766 |
. . . . . . 7
 |
| 14 | | funfvex 5575 |
. . . . . . . 8
 
       |
| 15 | 14 | funfni 5358 |
. . . . . . 7
 
       |
| 16 | 8, 13, 15 | mp2an 426 |
. . . . . 6
     |
| 17 | | oveq12 5931 |
. . . . . . . 8
           
             |
| 18 | 17 | ancoms 268 |
. . . . . . 7
           
             |
| 19 | | raleq 2693 |
. . . . . . . . . 10
    
 
                                                       
                                                                 |
| 20 | 19 | raleqbi1dv 2705 |
. . . . . . . . 9
    
 

                                                       
                                                                       |
| 21 | 20 | adantr 276 |
. . . . . . . 8
            

                                                        
     
                                                                |
| 22 | 21 | anbi2d 464 |
. . . . . . 7
                          
                                                                                                                                              |
| 23 | 18, 22 | rabeqbidv 2758 |
. . . . . 6
                           

                                                                                 
                                                                        |
| 24 | 12, 16, 23 | csbie2 3134 |
. . . . 5
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                                                                                         |
| 25 | | inrab 3435 |
. . . . 5
            
                                           
                                                                               
                                
     
                                                 |
| 26 | 7, 24, 25 | 3eqtr4i 2227 |
. . . 4
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                                                 |
| 27 | | ringgrp 13557 |
. . . . . . . 8

  |
| 28 | | ringgrp 13557 |
. . . . . . . 8

  |
| 29 | | eqid 2196 |
. . . . . . . . 9
         |
| 30 | | eqid 2196 |
. . . . . . . . 9
         |
| 31 | | eqid 2196 |
. . . . . . . . 9
       |
| 32 | | eqid 2196 |
. . . . . . . . 9
       |
| 33 | 29, 30, 31, 32 | isghm3 13374 |
. . . . . . . 8
 
   
            
                                          |
| 34 | 27, 28, 33 | syl2an 289 |
. . . . . . 7
     
            
                                          |
| 35 | 34 | eqabdv 2325 |
. . . . . 6
                   
                                         |
| 36 | | df-rab 2484 |
. . . . . . 7
                                                        
                                              |
| 37 | 16, 12 | elmap 6736 |
. . . . . . . . 9
                         |
| 38 | 37 | anbi1i 458 |
. . . . . . . 8
            
                                                         
                                  |
| 39 | 38 | abbii 2312 |
. . . . . . 7
      
                                                          
                                         |
| 40 | 36, 39 | eqtri 2217 |
. . . . . 6
                                                                      
                                  |
| 41 | 35, 40 | eqtr4di 2247 |
. . . . 5
          
           
                                  |
| 42 | | eqid 2196 |
. . . . . . . . 9
mulGrp  mulGrp   |
| 43 | 42 | ringmgp 13558 |
. . . . . . . 8

mulGrp    |
| 44 | | eqid 2196 |
. . . . . . . . 9
mulGrp  mulGrp   |
| 45 | 44 | ringmgp 13558 |
. . . . . . . 8

mulGrp    |
| 46 | 42, 29 | mgpbasg 13482 |
. . . . . . . . . . 11
        mulGrp     |
| 47 | 46 | elv 2767 |
. . . . . . . . . 10
       mulGrp    |
| 48 | 44, 30 | mgpbasg 13482 |
. . . . . . . . . . 11
        mulGrp     |
| 49 | 48 | elv 2767 |
. . . . . . . . . 10
       mulGrp    |
| 50 | | eqid 2196 |
. . . . . . . . . . . 12
         |
| 51 | 42, 50 | mgpplusgg 13480 |
. . . . . . . . . . 11
       mulGrp     |
| 52 | 51 | elv 2767 |
. . . . . . . . . 10
      mulGrp    |
| 53 | | eqid 2196 |
. . . . . . . . . . . 12
         |
| 54 | 44, 53 | mgpplusgg 13480 |
. . . . . . . . . . 11
       mulGrp     |
| 55 | 54 | elv 2767 |
. . . . . . . . . 10
      mulGrp    |
| 56 | | eqid 2196 |
. . . . . . . . . . . 12
         |
| 57 | 42, 56 | ringidvalg 13517 |
. . . . . . . . . . 11
        mulGrp     |
| 58 | 57 | elv 2767 |
. . . . . . . . . 10
       mulGrp    |
| 59 | | eqid 2196 |
. . . . . . . . . . . 12
         |
| 60 | 44, 59 | ringidvalg 13517 |
. . . . . . . . . . 11
        mulGrp     |
| 61 | 60 | elv 2767 |
. . . . . . . . . 10
       mulGrp    |
| 62 | 47, 49, 52, 55, 58, 61 | ismhm 13093 |
. . . . . . . . 9
  mulGrp 
MndHom mulGrp  
  mulGrp  mulGrp               
                                                        |
| 63 | 62 | baib 920 |
. . . . . . . 8
  mulGrp  mulGrp     mulGrp  MndHom mulGrp               
                                                        |
| 64 | 43, 45, 63 | syl2an 289 |
. . . . . . 7
     mulGrp  MndHom mulGrp  
            
                                                        |
| 65 | 64 | eqabdv 2325 |
. . . . . 6
    mulGrp  MndHom mulGrp                 
                                                       |
| 66 | | df-rab 2484 |
. . . . . . 7
                                                                        
            
                                                 |
| 67 | 37 | anbi1i 458 |
. . . . . . . . 9
             
     
                                              
            
 
                                                       |
| 68 | | 3anass 984 |
. . . . . . . . 9
              
                                                                                                                          |
| 69 | 67, 68 | bitr4i 187 |
. . . . . . . 8
             
     
                                              
            
                                                       |
| 70 | 69 | abbii 2312 |
. . . . . . 7
      
            
                                                                    
                                                |
| 71 | 66, 70 | eqtri 2217 |
. . . . . 6
                                                                               
                                                       |
| 72 | 65, 71 | eqtr4di 2247 |
. . . . 5
    mulGrp  MndHom mulGrp        
                                                              |
| 73 | 41, 72 | ineq12d 3365 |
. . . 4
       mulGrp 
MndHom mulGrp          
           
                                                  
                                                  |
| 74 | 26, 73 | eqtr4id 2248 |
. . 3
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                                                       mulGrp  MndHom mulGrp      |
| 75 | 74 | mpoeq3ia 5987 |
. 2
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    mulGrp  MndHom mulGrp      |
| 76 | 1, 75 | eqtri 2217 |
1
RingHom  
    mulGrp  MndHom mulGrp      |