Proof of Theorem ssrelrelOLD
| Step | Hyp | Ref
| Expression |
| 1 | | ssel 2615 |
. . . 4
                 |
| 2 | 1 | 19.21aiv 1664 |
. . 3
      
  
         |
| 3 | 2 | 19.21aivv 1665 |
. 2
                       |
| 4 | | ssel 2615 |
. . . . . . 7
     
       |
| 5 | | elvvv 4054 |
. . . . . . 7

                 |
| 6 | 4, 5 | syl6ib 229 |
. . . . . 6
     
              |
| 7 | | id 73 |
. . . . . . . . . . . . . . . 16
                               |
| 8 | 7 | anim2d 620 |
. . . . . . . . . . . . . . 15
                                               |
| 9 | | eleq1 1957 |
. . . . . . . . . . . . . . . 16
   
             |
| 10 | 9 | biimpar 461 |
. . . . . . . . . . . . . . 15
                 |
| 11 | 8, 10 | syl6 25 |
. . . . . . . . . . . . . 14
                                 |
| 12 | | eleq1 1957 |
. . . . . . . . . . . . . . 15
   
             |
| 13 | 12 | pm5.32i 707 |
. . . . . . . . . . . . . 14
       
                 |
| 14 | 11, 13 | syl5ib 223 |
. . . . . . . . . . . . 13
                      

   |
| 15 | 14 | exp3a 405 |
. . . . . . . . . . . 12
                           |
| 16 | 15 | alimi 1338 |
. . . . . . . . . . 11
         
            
        |
| 17 | | 19.23v 1672 |
. . . . . . . . . . 11
                          |
| 18 | 16, 17 | sylib 215 |
. . . . . . . . . 10
         
           
        |
| 19 | 18 | alimi 1338 |
. . . . . . . . 9
                                  |
| 20 | | 19.23v 1672 |
. . . . . . . . 9
                             |
| 21 | 19, 20 | sylib 215 |
. . . . . . . 8
                                  |
| 22 | 21 | alimi 1338 |
. . . . . . 7
             
               
        |
| 23 | | 19.23v 1672 |
. . . . . . 7
                                 |
| 24 | 22, 23 | sylib 215 |
. . . . . 6
             
               
        |
| 25 | 6, 24 | syl9 71 |
. . . . 5
                  
              |
| 26 | | pm2.43 77 |
. . . . 5
         |
| 27 | 25, 26 | syl6 25 |
. . . 4
                  
            |
| 28 | 27 | 19.21adv 1666 |
. . 3
                  
              |
| 29 | | dfss2 2610 |
. . 3
       |
| 30 | 28, 29 | syl6ibr 230 |
. 2
                  
          |
| 31 | 3, 30 | impbid2 576 |
1
                             |