| Step | Hyp | Ref
| Expression |
| 1 | | fveq2 5558 |
. . . . . 6
 mulGrp  mulGrp    |
| 2 | | isring.g |
. . . . . 6
mulGrp   |
| 3 | 1, 2 | eqtr4di 2247 |
. . . . 5
 mulGrp    |
| 4 | 3 | eleq1d 2265 |
. . . 4
  mulGrp 
   |
| 5 | | basfn 12736 |
. . . . . . 7
 |
| 6 | | vex 2766 |
. . . . . . 7
 |
| 7 | | funfvex 5575 |
. . . . . . . 8
 
       |
| 8 | 7 | funfni 5358 |
. . . . . . 7
 
       |
| 9 | 5, 6, 8 | mp2an 426 |
. . . . . 6
     |
| 10 | 9 | a1i 9 |
. . . . 5
       |
| 11 | | fveq2 5558 |
. . . . . 6
           |
| 12 | | isring.b |
. . . . . 6
     |
| 13 | 11, 12 | eqtr4di 2247 |
. . . . 5
       |
| 14 | | plusgslid 12790 |
. . . . . . . . 9
 Slot      
  |
| 15 | 14 | slotex 12705 |
. . . . . . . 8
      |
| 16 | 15 | elv 2767 |
. . . . . . 7
    |
| 17 | 16 | a1i 9 |
. . . . . 6
 
      |
| 18 | | simpl 109 |
. . . . . . . 8
 
   |
| 19 | 18 | fveq2d 5562 |
. . . . . . 7
 
         |
| 20 | | isring.p |
. . . . . . 7
    |
| 21 | 19, 20 | eqtr4di 2247 |
. . . . . 6
 
     |
| 22 | | mulrslid 12809 |
. . . . . . . . . 10
 Slot    
      |
| 23 | 22 | slotex 12705 |
. . . . . . . . 9
       |
| 24 | 23 | elv 2767 |
. . . . . . . 8
     |
| 25 | 24 | a1i 9 |
. . . . . . 7
          |
| 26 | | simpll 527 |
. . . . . . . . 9
      |
| 27 | 26 | fveq2d 5562 |
. . . . . . . 8
              |
| 28 | | isring.t |
. . . . . . . 8
     |
| 29 | 27, 28 | eqtr4di 2247 |
. . . . . . 7
         |
| 30 | | simpllr 534 |
. . . . . . . 8
       |
| 31 | | simpr 110 |
. . . . . . . . . . . . 13
      |
| 32 | | eqidd 2197 |
. . . . . . . . . . . . 13
       |
| 33 | | simplr 528 |
. . . . . . . . . . . . . 14
      |
| 34 | 33 | oveqd 5939 |
. . . . . . . . . . . . 13
             |
| 35 | 31, 32, 34 | oveq123d 5943 |
. . . . . . . . . . . 12
                   |
| 36 | 31 | oveqd 5939 |
. . . . . . . . . . . . 13
             |
| 37 | 31 | oveqd 5939 |
. . . . . . . . . . . . 13
             |
| 38 | 33, 36, 37 | oveq123d 5943 |
. . . . . . . . . . . 12
                    
    |
| 39 | 35, 38 | eqeq12d 2211 |
. . . . . . . . . . 11
                         
      
      |
| 40 | 33 | oveqd 5939 |
. . . . . . . . . . . . 13
             |
| 41 | | eqidd 2197 |
. . . . . . . . . . . . 13
       |
| 42 | 31, 40, 41 | oveq123d 5943 |
. . . . . . . . . . . 12
                   |
| 43 | 31 | oveqd 5939 |
. . . . . . . . . . . . 13
             |
| 44 | 33, 37, 43 | oveq123d 5943 |
. . . . . . . . . . . 12
                         |
| 45 | 42, 44 | eqeq12d 2211 |
. . . . . . . . . . 11
                         
 
    
      |
| 46 | 39, 45 | anbi12d 473 |
. . . . . . . . . 10
                                                        
 
 
    
       |
| 47 | 30, 46 | raleqbidv 2709 |
. . . . . . . . 9
      
                                                  
                 |
| 48 | 30, 47 | raleqbidv 2709 |
. . . . . . . 8
      

                                           
       
                 |
| 49 | 30, 48 | raleqbidv 2709 |
. . . . . . 7
      


                                           

       
                 |
| 50 | 25, 29, 49 | sbcied2 3027 |
. . . . . 6
           ![]. ].](_drbrack.gif) 


                                           

       
                 |
| 51 | 17, 21, 50 | sbcied2 3027 |
. . . . 5
 
       ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif)                                               

       
                 |
| 52 | 10, 13, 51 | sbcied2 3027 |
. . . 4
        ![]. ].](_drbrack.gif)      ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif) 


                                           

       
                 |
| 53 | 4, 52 | anbi12d 473 |
. . 3
   mulGrp        ![]. ].](_drbrack.gif)      ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif) 


                                          
 


 
      
 
 
    
        |
| 54 | | df-ring 13554 |
. . 3
  mulGrp        ![]. ].](_drbrack.gif)      ![]. ].](_drbrack.gif)       ![]. ].](_drbrack.gif) 


                                             |
| 55 | 53, 54 | elrab2 2923 |
. 2


 


 
      
 
 
    
        |
| 56 | | 3anass 984 |
. 2
 



  
                    
 


 
      
 
 
    
        |
| 57 | 55, 56 | bitr4i 187 |
1


           
 
 
    
       |