Proof of Theorem stadd3
| Step | Hyp | Ref
| Expression |
| 1 | | axaddass 5257 |
. . . 4
                    
                   
        |
| 2 | | stle.1 |
. . . . . 6
 |
| 3 | | stclt 10081 |
. . . . . 6


   
   |
| 4 | 2, 3 | mpi 44 |
. . . . 5

      |
| 5 | 4 | recnd 5295 |
. . . 4

      |
| 6 | | stle.2 |
. . . . . 6
 |
| 7 | | stclt 10081 |
. . . . . 6


   
   |
| 8 | 6, 7 | mpi 44 |
. . . . 5

      |
| 9 | 8 | recnd 5295 |
. . . 4

      |
| 10 | | stm1add3.3 |
. . . . . 6
 |
| 11 | | stclt 10081 |
. . . . . 6


   
   |
| 12 | 10, 11 | mpi 44 |
. . . . 5

      |
| 13 | 12 | recnd 5295 |
. . . 4

      |
| 14 | 1, 5, 9, 13 | syl3anc 857 |
. . 3

                                  |
| 15 | 14 | eqeq1d 1480 |
. 2

                     
              |
| 16 | | axaddrcl 5252 |
. . . . . . 7
                                   |
| 17 | | axaddrcl 5252 |
. . . . . . . 8
                       |
| 18 | 17, 8, 12 | sylanc 471 |
. . . . . . 7

    
       |
| 19 | 16, 4, 18 | sylanc 471 |
. . . . . 6

    
             |
| 20 | | 3re 5936 |
. . . . . 6
 |
| 21 | 19, 20 | jctir 293 |
. . . . 5

          
     
   |
| 22 | | ltnetOLD 5497 |
. . . . 5
                        
                    
         |
| 23 | 21, 22 | syl 10 |
. . . 4

          
                         |
| 24 | 23 | con2d 91 |
. . 3

          
                         |
| 25 | | 1re 5415 |
. . . . . . . . . . . . 13
 |
| 26 | 8, 25 | jctir 293 |
. . . . . . . . . . . 12

    
   |
| 27 | | axaddrcl 5252 |
. . . . . . . . . . . 12
               |
| 28 | 26, 27 | syl 10 |
. . . . . . . . . . 11

    
   |
| 29 | 25, 25 | readdcl 5314 |
. . . . . . . . . . . 12
   |
| 30 | 29 | a1i 8 |
. . . . . . . . . . 11

    |
| 31 | | stle1t 10090 |
. . . . . . . . . . . . 13


   
   |
| 32 | 10, 31 | mpi 44 |
. . . . . . . . . . . 12

      |
| 33 | | leadd2t 5608 |
. . . . . . . . . . . . 13
                                   |
| 34 | 25 | a1i 8 |
. . . . . . . . . . . . 13

  |
| 35 | 33, 12, 34, 8 | syl3anc 857 |
. . . . . . . . . . . 12

    
                   |
| 36 | 32, 35 | mpbid 195 |
. . . . . . . . . . 11

    
             |
| 37 | | stle1t 10090 |
. . . . . . . . . . . . 13


   
   |
| 38 | 6, 37 | mpi 44 |
. . . . . . . . . . . 12

      |
| 39 | | leadd1t 5607 |
. . . . . . . . . . . . 13
                       |
| 40 | 39, 8, 34, 34 | syl3anc 857 |
. . . . . . . . . . . 12

    
           |
| 41 | 38, 40 | mpbid 195 |
. . . . . . . . . . 11

    
     |
| 42 | 18, 28, 30, 36, 41 | letrd 5507 |
. . . . . . . . . 10

    
         |
| 43 | | leadd2t 5608 |
. . . . . . . . . . 11
                        
                                  |
| 44 | 43, 18, 30, 4 | syl3anc 857 |
. . . . . . . . . 10

                 
                      |
| 45 | 42, 44 | mpbid 195 |
. . . . . . . . 9

    
                     |
| 46 | 45 | adantr 389 |
. . . . . . . 8
     
                     
     |
| 47 | | ltadd1t 5605 |
. . . . . . . . . . 11
                             |
| 48 | 47 | biimpd 153 |
. . . . . . . . . 10
                  
          |
| 49 | 48, 4, 34, 30 | syl3anc 857 |
. . . . . . . . 9

    
               |
| 50 | 49 | imp 350 |
. . . . . . . 8
     
               |
| 51 | | lelttrt 5504 |
. . . . . . . . . 10
                                          
                                                  |
| 52 | 4, 29 | jctir 293 |
. . . . . . . . . . 11

    
     |
| 53 | | axaddrcl 5252 |
. . . . . . . . . . 11
                   |
| 54 | 52, 53 | syl 10 |
. . . . . . . . . 10

    
     |
| 55 | 25, 29 | readdcl 5314 |
. . . . . . . . . . 11
     |
| 56 | 55 | a1i 8 |
. . . . . . . . . 10

      |
| 57 | 51, 19, 54, 56 | syl3anc 857 |
. . . . . . . . 9

                      
                                       |
| 58 | 57 | adantr 389 |
. . . . . . . 8
     
  |