Proof of Theorem stadd3
| Step | Hyp | Ref
| Expression |
| 1 | | axaddass 5289 |
. . . 4
                    
                   
        |
| 2 | | stle.1 |
. . . . . 6
 |
| 3 | | stclt 10138 |
. . . . . 6


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

      |
| 5 | 4 | recnd 5327 |
. . . 4

      |
| 6 | | stle.2 |
. . . . . 6
 |
| 7 | | stclt 10138 |
. . . . . 6


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

      |
| 9 | 8 | recnd 5327 |
. . . 4

      |
| 10 | | stm1add3.3 |
. . . . . 6
 |
| 11 | | stclt 10138 |
. . . . . 6


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

      |
| 13 | 12 | recnd 5327 |
. . . 4

      |
| 14 | 1, 5, 9, 13 | syl3anc 860 |
. . 3

                                  |
| 15 | 14 | eqeq1d 1486 |
. 2

                     
              |
| 16 | | 3re 5983 |
. . . . . 6
 |
| 17 | | axaddrcl 5284 |
. . . . . . . 8
                                   |
| 18 | | axaddrcl 5284 |
. . . . . . . . 9
                       |
| 19 | 18, 8, 12 | sylanc 473 |
. . . . . . . 8

    
       |
| 20 | 17, 4, 19 | sylanc 473 |
. . . . . . 7

    
             |
| 21 | | ltnet 5528 |
. . . . . . . 8
                                            
        |
| 22 | 21 | 3exp 834 |
. . . . . . 7
          
                                 
          |
| 23 | 20, 22 | syl 10 |
. . . . . 6

                      
               |
| 24 | 16, 23 | mpi 44 |
. . . . 5

          
                         |
| 25 | 24 | necon2bd 1618 |
. . . 4

                                    |
| 26 | | eqcom 1480 |
. . . 4
          
                        |
| 27 | 25, 26 | syl5ib 206 |
. . 3

          
                         |
| 28 | | 1re 5447 |
. . . . . . . . . . . . 13
 |
| 29 | 8, 28 | jctir 293 |
. . . . . . . . . . . 12

    
   |
| 30 | | axaddrcl 5284 |
. . . . . . . . . . . 12
               |
| 31 | 29, 30 | syl 10 |
. . . . . . . . . . 11

    
   |
| 32 | 28, 28 | readdcl 5346 |
. . . . . . . . . . . 12
   |
| 33 | 32 | a1i 8 |
. . . . . . . . . . 11

    |
| 34 | | stle1t 10147 |
. . . . . . . . . . . . 13


   
   |
| 35 | 10, 34 | mpi 44 |
. . . . . . . . . . . 12

      |
| 36 | | leadd2t 5638 |
. . . . . . . . . . . . 13
                                   |
| 37 | 28 | a1i 8 |
. . . . . . . . . . . . 13

  |
| 38 | 36, 12, 37, 8 | syl3anc 860 |
. . . . . . . . . . . 12

    
                   |
| 39 | 35, 38 | mpbid 195 |
. . . . . . . . . . 11

    
             |
| 40 | | stle1t 10147 |
. . . . . . . . . . . . 13


   
   |
| 41 | 6, 40 | mpi 44 |
. . . . . . . . . . . 12

      |
| 42 | | leadd1t 5637 |
. . . . . . . . . . . . 13
                       |
| 43 | 42, 8, 37, 37 | syl3anc 860 |
. . . . . . . . . . . 12

    
           |
| 44 | 41, 43 | mpbid 195 |
. . . . . . . . . . 11

    
     |
| 45 | 19, 31, 33, 39, 44 | letrd 5538 |
. . . . . . . . . 10

    
         |
| 46 | | leadd2t 5638 |
. . . . . . . . . . 11
                        
                                  |
| 47 | 46, 19, 33, 4 | syl3anc 860 |
. . . . . . . . . 10

                 
                      |
| 48 | 45, 47 | mpbid 195 |
. . . . . . . . 9

    
                     |
| 49 | 48 | adantr 391 |
. . . . . . . 8
     
                     
     |
| 50 | | ltadd1t 5635 |
. . . . . . . . . . 11
                             |
| 51 | 50 | biimpd 153 |
. . . . . . . . . 10
                  
          |
| 52 | 51, 4, 37, 33 | syl3anc 860 |
. . . . . . . . 9

    
               |
| 53 | 52 | imp 350 |
. . . . . . . 8
     
               |
| 54 | | lelttrt 5535 |
. . . . . . . . . 10
                                          
                                                  |
| 55 | 4, 32 | jctir 293 |
. . . . . . . . . . 11

    
     |
| 56 | | axaddrcl 5284 |
. . . . . . . . . . 11
  |