| Step | Hyp | Ref
| Expression |
| 1 | | lring.l |
. . . . . . . 8
 LRing |
| 2 | | lringring 13750 |
. . . . . . . 8
 LRing   |
| 3 | 1, 2 | syl 14 |
. . . . . . 7
   |
| 4 | | lring.x |
. . . . . . . 8
   |
| 5 | | lring.b |
. . . . . . . 8
       |
| 6 | 4, 5 | eleqtrd 2275 |
. . . . . . 7
       |
| 7 | | lring.s |
. . . . . . . 8
     |
| 8 | | lring.u |
. . . . . . . 8
 Unit    |
| 9 | 7, 8 | eleqtrd 2275 |
. . . . . . 7
   Unit    |
| 10 | | eqid 2196 |
. . . . . . . 8
         |
| 11 | | eqid 2196 |
. . . . . . . 8
Unit  Unit   |
| 12 | | eqid 2196 |
. . . . . . . 8
/r  /r   |
| 13 | | eqid 2196 |
. . . . . . . 8
         |
| 14 | 10, 11, 12, 13 | dvrcan1 13696 |
. . . . . . 7
     
  Unit      /r                 |
| 15 | 3, 6, 9, 14 | syl3anc 1249 |
. . . . . 6
    /r                 |
| 16 | 15 | adantr 276 |
. . . . 5
 
  /r      Unit      /r                 |
| 17 | 3 | adantr 276 |
. . . . . 6
 
  /r      Unit  
  |
| 18 | | simpr 110 |
. . . . . 6
 
  /r      Unit     /r      Unit    |
| 19 | 9 | adantr 276 |
. . . . . 6
 
  /r      Unit     Unit    |
| 20 | 11, 13 | unitmulcl 13669 |
. . . . . 6
    /r      Unit    Unit  
   /r               Unit    |
| 21 | 17, 18, 19, 20 | syl3anc 1249 |
. . . . 5
 
  /r      Unit      /r               Unit    |
| 22 | 16, 21 | eqeltrrd 2274 |
. . . 4
 
  /r      Unit  
Unit    |
| 23 | 8 | adantr 276 |
. . . 4
 
  /r      Unit  
Unit    |
| 24 | 22, 23 | eleqtrrd 2276 |
. . 3
 
  /r      Unit  
  |
| 25 | 24 | orcd 734 |
. 2
 
  /r      Unit   
   |
| 26 | | lring.y |
. . . . . . . 8
   |
| 27 | 26, 5 | eleqtrd 2275 |
. . . . . . 7
       |
| 28 | 10, 11, 12, 13 | dvrcan1 13696 |
. . . . . . 7
     
  Unit      /r                 |
| 29 | 3, 27, 9, 28 | syl3anc 1249 |
. . . . . 6
    /r                 |
| 30 | 29 | adantr 276 |
. . . . 5
 
  /r      Unit      /r                 |
| 31 | 3 | adantr 276 |
. . . . . 6
 
  /r      Unit  
  |
| 32 | | simpr 110 |
. . . . . 6
 
  /r      Unit     /r      Unit    |
| 33 | 9 | adantr 276 |
. . . . . 6
 
  /r      Unit     Unit    |
| 34 | 11, 13 | unitmulcl 13669 |
. . . . . 6
    /r      Unit    Unit  
   /r               Unit    |
| 35 | 31, 32, 33, 34 | syl3anc 1249 |
. . . . 5
 
  /r      Unit      /r               Unit    |
| 36 | 30, 35 | eqeltrrd 2274 |
. . . 4
 
  /r      Unit  
Unit    |
| 37 | 8 | adantr 276 |
. . . 4
 
  /r      Unit  
Unit    |
| 38 | 36, 37 | eleqtrrd 2276 |
. . 3
 
  /r      Unit  
  |
| 39 | 38 | olcd 735 |
. 2
 
  /r      Unit   
   |
| 40 | | eqid 2196 |
. . . . . 6
       |
| 41 | 10, 11, 40, 12 | dvrdir 13699 |
. . . . 5
  
       
  Unit             /r         /r             /r         |
| 42 | 3, 6, 27, 9, 41 | syl13anc 1251 |
. . . 4
          /r         /r             /r         |
| 43 | | lring.p |
. . . . . . 7
      |
| 44 | 43 | eqcomd 2202 |
. . . . . 6
     |
| 45 | 44 | oveqd 5939 |
. . . . 5
            |
| 46 | 3 | ringgrpd 13561 |
. . . . . . 7
   |
| 47 | 10, 40, 46, 6, 27 | grpcld 13146 |
. . . . . 6
              |
| 48 | | eqid 2196 |
. . . . . . 7
         |
| 49 | 10, 11, 12, 48 | dvreq1 13698 |
. . . . . 6
            
  Unit             /r         
  
         |
| 50 | 3, 47, 9, 49 | syl3anc 1249 |
. . . . 5
           /r         
  
         |
| 51 | 45, 50 | mpbird 167 |
. . . 4
          /r            |
| 52 | 42, 51 | eqtr3d 2231 |
. . 3
    /r             /r             |
| 53 | | oveq2 5930 |
. . . . . 6
   /r         /r               /r             /r         |
| 54 | 53 | eqeq1d 2205 |
. . . . 5
   /r          /r                   /r             /r              |
| 55 | | eleq1 2259 |
. . . . . 6
   /r       Unit    /r      Unit     |
| 56 | 55 | orbi2d 791 |
. . . . 5
   /r          /r      Unit  Unit      /r      Unit    /r      Unit      |
| 57 | 54, 56 | imbi12d 234 |
. . . 4
   /r           /r                   /r      Unit  Unit   
    /r             /r              /r      Unit    /r      Unit       |
| 58 | | oveq1 5929 |
. . . . . . . 8
   /r                /r              |
| 59 | 58 | eqeq1d 2205 |
. . . . . . 7
   /r                     /r                   |
| 60 | | eleq1 2259 |
. . . . . . . 8
   /r       Unit    /r      Unit     |
| 61 | 60 | orbi1d 792 |
. . . . . . 7
   /r        Unit  Unit      /r      Unit  Unit      |
| 62 | 59, 61 | imbi12d 234 |
. . . . . 6
   /r                  
 Unit 
Unit        /r               
   /r      Unit  Unit       |
| 63 | 62 | ralbidv 2497 |
. . . . 5
   /r                        
 Unit 
Unit    
         /r               
   /r      Unit  Unit       |
| 64 | 10, 40, 48, 11 | islring 13748 |
. . . . . . 7
 LRing  NzRing 
                      
 Unit 
Unit       |
| 65 | 1, 64 | sylib 122 |
. . . . . 6
  NzRing 
                      
 Unit 
Unit       |
| 66 | 65 | simprd 114 |
. . . . 5
       
                  Unit  Unit      |
| 67 | 10, 11, 12 | dvrcl 13691 |
. . . . . 6
     
  Unit     /r            |
| 68 | 3, 6, 9, 67 | syl3anc 1249 |
. . . . 5
   /r            |
| 69 | 63, 66, 68 | rspcdva 2873 |
. . . 4
           /r               
   /r      Unit  Unit      |
| 70 | 10, 11, 12 | dvrcl 13691 |
. . . . 5
     
  Unit     /r            |
| 71 | 3, 27, 9, 70 | syl3anc 1249 |
. . . 4
   /r            |
| 72 | 57, 69, 71 | rspcdva 2873 |
. . 3
     /r             /r              /r      Unit    /r      Unit      |
| 73 | 52, 72 | mpd 13 |
. 2
    /r      Unit    /r      Unit     |
| 74 | 25, 39, 73 | mpjaodan 799 |
1
 
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