| Step | Hyp | Ref
| Expression |
| 1 | | 0ex 4161 |
. . . . 5
 |
| 2 | 1 | eldm 4864 |
. . . 4

      |
| 3 | | vex 2766 |
. . . . . . 7
 |
| 4 | | brtpos0 6319 |
. . . . . . 7
  tpos 
     |
| 5 | 3, 4 | ax-mp 5 |
. . . . . 6
 tpos      |
| 6 | | 0nelxp 4692 |
. . . . . . . 8
   |
| 7 | | df-rel 4671 |
. . . . . . . . 9
 tpos tpos
    |
| 8 | | ssel 3178 |
. . . . . . . . 9
 tpos  
 tpos
     |
| 9 | 7, 8 | sylbi 121 |
. . . . . . . 8
 tpos
 tpos      |
| 10 | 6, 9 | mtoi 665 |
. . . . . . 7
 tpos
tpos   |
| 11 | 1, 3 | breldm 4871 |
. . . . . . 7
 tpos 
tpos   |
| 12 | 10, 11 | nsyl3 627 |
. . . . . 6
 tpos 
tpos   |
| 13 | 5, 12 | sylbir 135 |
. . . . 5
   tpos   |
| 14 | 13 | exlimiv 1612 |
. . . 4
    
tpos   |
| 15 | 2, 14 | sylbi 121 |
. . 3
 tpos   |
| 16 | 15 | con2i 628 |
. 2
 tpos
  |
| 17 | | vex 2766 |
. . . . . 6
 |
| 18 | 17 | eldm 4864 |
. . . . 5
 tpos
 tpos    |
| 19 | | relcnv 5048 |
. . . . . . . . . . 11
  |
| 20 | | df-rel 4671 |
. . . . . . . . . . 11
 
     |
| 21 | 19, 20 | mpbi 145 |
. . . . . . . . . 10
    |
| 22 | 21 | sseli 3180 |
. . . . . . . . 9
      |
| 23 | 22 | a1i 9 |
. . . . . . . 8
  tpos          |
| 24 | | elsni 3641 |
. . . . . . . . . . . 12
     |
| 25 | 24 | breq1d 4044 |
. . . . . . . . . . 11
    tpos 
tpos     |
| 26 | 1, 3 | breldm 4871 |
. . . . . . . . . . . . 13
     |
| 27 | 26 | pm2.24d 623 |
. . . . . . . . . . . 12
         |
| 28 | 5, 27 | sylbi 121 |
. . . . . . . . . . 11
 tpos 

     |
| 29 | 25, 28 | biimtrdi 163 |
. . . . . . . . . 10
    tpos         |
| 30 | 29 | com3l 81 |
. . . . . . . . 9
 tpos     

     |
| 31 | 30 | impcom 125 |
. . . . . . . 8
  tpos           |
| 32 | | brtpos2 6318 |
. . . . . . . . . . . 12
  tpos 
                |
| 33 | 3, 32 | ax-mp 5 |
. . . . . . . . . . 11
 tpos 
               |
| 34 | 33 | simplbi 274 |
. . . . . . . . . 10
 tpos         |
| 35 | | elun 3305 |
. . . . . . . . . 10
             |
| 36 | 34, 35 | sylib 122 |
. . . . . . . . 9
 tpos         |
| 37 | 36 | adantl 277 |
. . . . . . . 8
  tpos          |
| 38 | 23, 31, 37 | mpjaod 719 |
. . . . . . 7
  tpos       |
| 39 | 38 | ex 115 |
. . . . . 6
  tpos       |
| 40 | 39 | exlimdv 1833 |
. . . . 5
   tpos       |
| 41 | 18, 40 | biimtrid 152 |
. . . 4
  tpos      |
| 42 | 41 | ssrdv 3190 |
. . 3
 tpos
    |
| 43 | 42, 7 | sylibr 134 |
. 2
 tpos   |
| 44 | 16, 43 | impbii 126 |
1
 tpos
  |