| Step | Hyp | Ref
| Expression |
| 1 | | fveq2 6191 |
. . . . . 6
 mulGrp  mulGrp    |
| 2 | | isring.g |
. . . . . 6
mulGrp   |
| 3 | 1, 2 | syl6eqr 2674 |
. . . . 5
 mulGrp    |
| 4 | 3 | eleq1d 2686 |
. . . 4
  mulGrp 
   |
| 5 | | fvexd 6203 |
. . . . 5
       |
| 6 | | fveq2 6191 |
. . . . . 6
           |
| 7 | | isring.b |
. . . . . 6
     |
| 8 | 6, 7 | syl6eqr 2674 |
. . . . 5
       |
| 9 | | fvexd 6203 |
. . . . . 6
 
      |
| 10 | | simpl 473 |
. . . . . . . 8
 
   |
| 11 | 10 | fveq2d 6195 |
. . . . . . 7
 
         |
| 12 | | isring.p |
. . . . . . 7
    |
| 13 | 11, 12 | syl6eqr 2674 |
. . . . . 6
 
     |
| 14 | | fvexd 6203 |
. . . . . . 7
          |
| 15 | | simpll 790 |
. . . . . . . . 9
      |
| 16 | 15 | fveq2d 6195 |
. . . . . . . 8
              |
| 17 | | isring.t |
. . . . . . . 8
     |
| 18 | 16, 17 | syl6eqr 2674 |
. . . . . . 7
         |
| 19 | | simpllr 799 |
. . . . . . . 8
       |
| 20 | | simpr 477 |
. . . . . . . . . . . . 13
      |
| 21 | | eqidd 2623 |
. . . . . . . . . . . . 13
       |
| 22 | | simplr 792 |
. . . . . . . . . . . . . 14
      |
| 23 | 22 | oveqd 6667 |
. . . . . . . . . . . . 13
             |
| 24 | 20, 21, 23 | oveq123d 6671 |
. . . . . . . . . . . 12
                   |
| 25 | 20 | oveqd 6667 |
. . . . . . . . . . . . 13
             |
| 26 | 20 | oveqd 6667 |
. . . . . . . . . . . . 13
             |
| 27 | 22, 25, 26 | oveq123d 6671 |
. . . . . . . . . . . 12
                    
    |
| 28 | 24, 27 | eqeq12d 2637 |
. . . . . . . . . . 11
                         
      
      |
| 29 | 22 | oveqd 6667 |
. . . . . . . . . . . . 13
             |
| 30 | | eqidd 2623 |
. . . . . . . . . . . . 13
       |
| 31 | 20, 29, 30 | oveq123d 6671 |
. . . . . . . . . . . 12
                   |
| 32 | 20 | oveqd 6667 |
. . . . . . . . . . . . 13
             |
| 33 | 22, 26, 32 | oveq123d 6671 |
. . . . . . . . . . . 12
                         |
| 34 | 31, 33 | eqeq12d 2637 |
. . . . . . . . . . 11
                         
 
    
      |
| 35 | 28, 34 | anbi12d 747 |
. . . . . . . . . 10
                                                        
 
 
    
       |
| 36 | 19, 35 | raleqbidv 3152 |
. . . . . . . . 9
      
                                                  
                 |
| 37 | 19, 36 | raleqbidv 3152 |
. . . . . . . 8
      

                                           
       
                 |
| 38 | 19, 37 | raleqbidv 3152 |
. . . . . . 7
      


                                           

       
                 |
| 39 | 14, 18, 38 | sbcied2 3473 |
. . . . . 6
           ![]. ].](_drbrack.gif) 


                                           

       
                 |
| 40 | 9, 13, 39 | sbcied2 3473 |
. . . . 5
 
       ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif)                                               

       
                 |
| 41 | 5, 8, 40 | sbcied2 3473 |
. . . 4
        ![]. ].](_drbrack.gif)      ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif) 


                                           

       
                 |
| 42 | 4, 41 | anbi12d 747 |
. . 3
   mulGrp        ![]. ].](_drbrack.gif)      ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif) 


                                          
 


 
      
 
 
    
        |
| 43 | | df-ring 18549 |
. . 3
  mulGrp        ![]. ].](_drbrack.gif)      ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif) 


                                             |
| 44 | 42, 43 | elrab2 3366 |
. 2


 


 
      
 
 
    
        |
| 45 | | 3anass 1042 |
. 2
 



  
                    
 


 
      
 
 
    
        |
| 46 | 44, 45 | bitr4i 267 |
1


           
 
 
    
       |