Proof of Theorem axpownd
| Step | Hyp | Ref
| Expression |
| 1 | | axpowndlem4 5017 |
. 2
              
      |
| 2 | | axpowndlem1 5014 |
. . 3
            
     |
| 3 | 2 | alequcoms 1185 |
. 2
            
     |
| 4 | 2 | a1d 12 |
. . 3
                     |
| 5 | | hbnae 1189 |
. . . . . . . 8
      |
| 6 | | hbae 1187 |
. . . . . . . 8
       |
| 7 | 5, 6 | hban 1050 |
. . . . . . 7
             |
| 8 | | el 2807 |
. . . . . . . . . . . . 13

 |
| 9 | | dveel1 1398 |
. . . . . . . . . . . . . . 15
       |
| 10 | 9 | nalequcoms 1186 |
. . . . . . . . . . . . . 14
       |
| 11 | | elequ2 1179 |
. . . . . . . . . . . . . . 15
     |
| 12 | 11 | a1i 8 |
. . . . . . . . . . . . . 14
   
    |
| 13 | 5, 10, 12 | cbvexd 1363 |
. . . . . . . . . . . . 13
        |
| 14 | 8, 13 | mpbii 200 |
. . . . . . . . . . . 12
     |
| 15 | | 19.8a 1070 |
. . . . . . . . . . . 12
       |
| 16 | 14, 15 | syl 10 |
. . . . . . . . . . 11
       |
| 17 | | df-ex 1022 |
. . . . . . . . . . 11
        |
| 18 | 16, 17 | sylib 205 |
. . . . . . . . . 10
  

  |
| 19 | 18 | adantr 398 |
. . . . . . . . 9
         |
| 20 | | pm4.2d 178 |
. . . . . . . . . . . . . 14
      |
| 21 | 20 | dral1 1196 |
. . . . . . . . . . . . 13
        |
| 22 | | alnex 1074 |
. . . . . . . . . . . . 13
     |
| 23 | | alnex 1074 |
. . . . . . . . . . . . 13
     |
| 24 | 21, 22, 23 | 3bitr3g 565 |
. . . . . . . . . . . 12
        |
| 25 | | nd2 5004 |
. . . . . . . . . . . . 13
     |
| 26 | | mtt 724 |
. . . . . . . . . . . . 13
           |
| 27 | 25, 26 | syl 10 |
. . . . . . . . . . . 12
           |
| 28 | 24, 27 | bitrd 539 |
. . . . . . . . . . 11
           |
| 29 | 28 | dral2 1197 |
. . . . . . . . . 10
              |
| 30 | 29 | adantl 397 |
. . . . . . . . 9
                 |
| 31 | 19, 30 | mtbid 726 |
. . . . . . . 8
             |
| 32 | 31 | pm2.21d 81 |
. . . . . . 7
               |
| 33 | 7, 32 | 19.21ai 1039 |
. . . . . 6
            
    |
| 34 | | 19.8a 1070 |
. . . . . 6
                    
    |
| 35 | 33, 34 | syl 10 |
. . . . 5
                   |
| 36 | 35 | a1d 12 |
. . . 4
     
         
     |
| 37 | 36 | ex 380 |
. . 3
                     |
| 38 | 4, 37 | pm2.61i 132 |
. 2
            
     |
| 39 | 1, 3, 38 | pm2.61ii 136 |
1

         
    |