| Step | Hyp | Ref
| Expression |
| 1 | | unitpropdg.1 |
. . . . . . 7
       |
| 2 | | unitpropdg.2 |
. . . . . . 7
       |
| 3 | | unitpropdg.3 |
. . . . . . 7
 

                    |
| 4 | | unitpropdg.k |
. . . . . . 7
   |
| 5 | | unitpropdg.l |
. . . . . . 7
   |
| 6 | 1, 2, 3, 4, 5 | rngidpropdg 13778 |
. . . . . 6
           |
| 7 | 6 | breq2d 4046 |
. . . . 5
    r      
  r          |
| 8 | 6 | breq2d 4046 |
. . . . 5
    r oppr       
  r oppr           |
| 9 | 7, 8 | anbi12d 473 |
. . . 4
     r         r oppr        
   r         r oppr            |
| 10 | | ringsrg 13679 |
. . . . . . . 8

SRing |
| 11 | 4, 10 | syl 14 |
. . . . . . 7
 SRing |
| 12 | | ringsrg 13679 |
. . . . . . . 8

SRing |
| 13 | 5, 12 | syl 14 |
. . . . . . 7
 SRing |
| 14 | 1, 2, 3, 11, 13 | dvdsrpropdg 13779 |
. . . . . 6
  r   r    |
| 15 | 14 | breqd 4045 |
. . . . 5
    r      
  r          |
| 16 | | eqid 2196 |
. . . . . . . . . 10
oppr  oppr   |
| 17 | | eqid 2196 |
. . . . . . . . . 10
         |
| 18 | 16, 17 | opprbasg 13707 |
. . . . . . . . 9

       oppr     |
| 19 | 4, 18 | syl 14 |
. . . . . . . 8
        oppr     |
| 20 | 1, 19 | eqtrd 2229 |
. . . . . . 7
    oppr     |
| 21 | | eqid 2196 |
. . . . . . . . . 10
oppr  oppr   |
| 22 | | eqid 2196 |
. . . . . . . . . 10
         |
| 23 | 21, 22 | opprbasg 13707 |
. . . . . . . . 9

       oppr     |
| 24 | 5, 23 | syl 14 |
. . . . . . . 8
        oppr     |
| 25 | 2, 24 | eqtrd 2229 |
. . . . . . 7
    oppr     |
| 26 | 3 | ancom2s 566 |
. . . . . . . 8
 

                    |
| 27 | 4 | adantr 276 |
. . . . . . . . 9
 

 
  |
| 28 | | simprl 529 |
. . . . . . . . 9
 

    |
| 29 | | simprr 531 |
. . . . . . . . 9
 

 
  |
| 30 | | eqid 2196 |
. . . . . . . . . 10
         |
| 31 | | eqid 2196 |
. . . . . . . . . 10
   oppr      oppr    |
| 32 | 17, 30, 16, 31 | opprmulg 13703 |
. . . . . . . . 9
 
      oppr               |
| 33 | 27, 28, 29, 32 | syl3anc 1249 |
. . . . . . . 8
 

       oppr               |
| 34 | 5 | adantr 276 |
. . . . . . . . 9
 

 
  |
| 35 | | eqid 2196 |
. . . . . . . . . 10
         |
| 36 | | eqid 2196 |
. . . . . . . . . 10
   oppr      oppr    |
| 37 | 22, 35, 21, 36 | opprmulg 13703 |
. . . . . . . . 9
 
      oppr               |
| 38 | 34, 28, 29, 37 | syl3anc 1249 |
. . . . . . . 8
 

       oppr               |
| 39 | 26, 33, 38 | 3eqtr4d 2239 |
. . . . . . 7
 

       oppr          oppr       |
| 40 | 16 | opprring 13711 |
. . . . . . . 8

oppr    |
| 41 | | ringsrg 13679 |
. . . . . . . 8
 oppr  oppr  SRing |
| 42 | 4, 40, 41 | 3syl 17 |
. . . . . . 7
 oppr  SRing |
| 43 | 21 | opprring 13711 |
. . . . . . . 8

oppr    |
| 44 | | ringsrg 13679 |
. . . . . . . 8
 oppr  oppr  SRing |
| 45 | 5, 43, 44 | 3syl 17 |
. . . . . . 7
 oppr  SRing |
| 46 | 20, 25, 39, 42, 45 | dvdsrpropdg 13779 |
. . . . . 6
  r oppr    r oppr     |
| 47 | 46 | breqd 4045 |
. . . . 5
    r oppr       
  r oppr           |
| 48 | 15, 47 | anbi12d 473 |
. . . 4
     r         r oppr        
   r         r oppr            |
| 49 | 9, 48 | bitrd 188 |
. . 3
     r         r oppr        
   r         r oppr            |
| 50 | | eqidd 2197 |
. . . 4
 Unit  Unit    |
| 51 | | eqidd 2197 |
. . . 4
           |
| 52 | | eqidd 2197 |
. . . 4
  r   r    |
| 53 | | eqidd 2197 |
. . . 4
 oppr  oppr    |
| 54 | | eqidd 2197 |
. . . 4
  r oppr    r oppr     |
| 55 | 50, 51, 52, 53, 54, 11 | isunitd 13738 |
. . 3
  Unit 
   r         r oppr            |
| 56 | | eqidd 2197 |
. . . 4
 Unit  Unit    |
| 57 | | eqidd 2197 |
. . . 4
           |
| 58 | | eqidd 2197 |
. . . 4
  r   r    |
| 59 | | eqidd 2197 |
. . . 4
 oppr  oppr    |
| 60 | | eqidd 2197 |
. . . 4
  r oppr    r oppr     |
| 61 | 56, 57, 58, 59, 60, 13 | isunitd 13738 |
. . 3
  Unit 
   r         r oppr            |
| 62 | 49, 55, 61 | 3bitr4d 220 |
. 2
  Unit 
Unit     |
| 63 | 62 | eqrdv 2194 |
1
 Unit  Unit    |