| Step | Hyp | Ref
 | Expression | 
| 1 |   | df-mpt 5653 | 
. . 3
              
                                                    | 
| 2 |   | enmap1lem1.1 | 
. . 3
        
                     | 
| 3 |   | opelres 4951 | 
. . . . 5
      
                             
           Compose
                                                     
      Compose        
          | 
| 4 |   | elima 4755 | 
. . . . . . . . 9
      
                                        Compose          Compose                             
            | 
| 5 |   | trtxp 5782 | 
. . . . . . . . . . . 12
                               
                                                   | 
| 6 |   | brco 4884 | 
. . . . . . . . . . . . . 14
                                                                    | 
| 7 |   | ancom 437 | 
. . . . . . . . . . . . . . . 16
                                                                    | 
| 8 |   | brin 4694 | 
. . . . . . . . . . . . . . . . . 18
                                                      | 
| 9 |   | vex 2863 | 
. . . . . . . . . . . . . . . . . . . . 21
        | 
| 10 |   | brxp 4813 | 
. . . . . . . . . . . . . . . . . . . . 21
                                       
      | 
| 11 | 9, 10 | mpbiran2 885 | 
. . . . . . . . . . . . . . . . . . . 20
                                    | 
| 12 |   | eliniseg 5021 | 
. . . . . . . . . . . . . . . . . . . 20
                       | 
| 13 | 11, 12 | bitri 240 | 
. . . . . . . . . . . . . . . . . . 19
                           | 
| 14 | 13 | anbi1i 676 | 
. . . . . . . . . . . . . . . . . 18
                                           | 
| 15 |   | vex 2863 | 
. . . . . . . . . . . . . . . . . . 19
        | 
| 16 | 15, 9 | op1st2nd 5791 | 
. . . . . . . . . . . . . . . . . 18
                             | 
| 17 | 8, 14, 16 | 3bitri 262 | 
. . . . . . . . . . . . . . . . 17
                                        | 
| 18 | 17 | anbi1i 676 | 
. . . . . . . . . . . . . . . 16
                                            
           | 
| 19 | 7, 18 | bitri 240 | 
. . . . . . . . . . . . . . 15
                                                        | 
| 20 | 19 | exbii 1582 | 
. . . . . . . . . . . . . 14
                                                            | 
| 21 | 15, 9 | opex 4589 | 
. . . . . . . . . . . . . . 15
             | 
| 22 |   | breq2 4644 | 
. . . . . . . . . . . . . . 15
                                  | 
| 23 | 21, 22 | ceqsexv 2895 | 
. . . . . . . . . . . . . 14
             
                      | 
| 24 | 6, 20, 23 | 3bitri 262 | 
. . . . . . . . . . . . 13
                                            | 
| 25 | 24 | anbi1i 676 | 
. . . . . . . . . . . 12
                                                            | 
| 26 |   | vex 2863 | 
. . . . . . . . . . . . 13
        | 
| 27 | 21, 26 | op1st2nd 5791 | 
. . . . . . . . . . . 12
                                       | 
| 28 | 5, 25, 27 | 3bitri 262 | 
. . . . . . . . . . 11
                               
                              | 
| 29 | 28 | rexbii 2640 | 
. . . . . . . . . 10
       
Compose                             
                  Compose                  | 
| 30 |   | risset 2662 | 
. . . . . . . . . 10
                 Compose        Compose                  | 
| 31 | 29, 30 | bitr4i 243 | 
. . . . . . . . 9
       
Compose                             
                           Compose   | 
| 32 | 4, 31 | bitri 240 | 
. . . . . . . 8
      
                                        Compose                   Compose   | 
| 33 |   | df-br 4641 | 
. . . . . . . 8
      
   Compose
                  Compose   | 
| 34 | 32, 33 | bitr4i 243 | 
. . . . . . 7
      
                                        Compose           
Compose    | 
| 35 |   | brcomposeg 5820 | 
. . . . . . . 8
               
            
Compose              
    | 
| 36 | 15, 9, 35 | mp2an 653 | 
. . . . . . 7
      
   Compose
                 | 
| 37 |   | eqcom 2355 | 
. . . . . . 7
                              | 
| 38 | 34, 36, 37 | 3bitri 262 | 
. . . . . 6
      
                                        Compose                  | 
| 39 | 38 | anbi2ci 677 | 
. . . . 5
                                                Compose                 
 
                             | 
| 40 | 3, 39 | bitri 240 | 
. . . 4
      
                             
           Compose
                               
            | 
| 41 | 40 | opabbi2i 4867 | 
. . 3
                               
      Compose       
            
                     
            | 
| 42 | 1, 2, 41 | 3eqtr4i 2383 | 
. 2
                                          Compose    
         | 
| 43 |   | 1stex 4740 | 
. . . . . . . . . 10
        | 
| 44 | 43 | cnvex 5103 | 
. . . . . . . . 9
         | 
| 45 |   | snex 4112 | 
. . . . . . . . 9
       
  | 
| 46 | 44, 45 | imaex 4748 | 
. . . . . . . 8
            
  | 
| 47 |   | vvex 4110 | 
. . . . . . . 8
        | 
| 48 | 46, 47 | xpex 5116 | 
. . . . . . 7
                  
  | 
| 49 |   | 2ndex 5113 | 
. . . . . . 7
        | 
| 50 | 48, 49 | inex 4106 | 
. . . . . 6
                           | 
| 51 | 50, 43 | coex 4751 | 
. . . . 5
                                 | 
| 52 | 51, 49 | txpex 5786 | 
. . . 4
                        
              | 
| 53 |   | composeex 5821 | 
. . . 4
  Compose     | 
| 54 | 52, 53 | imaex 4748 | 
. . 3
                              
      Compose       | 
| 55 |   | ovex 5552 | 
. . 3
              | 
| 56 | 54, 55 | resex 5118 | 
. 2
                               
      Compose       
          | 
| 57 | 42, 56 | eqeltri 2423 | 
1
        |