| Step | Hyp | Ref
| Expression |
| 1 | | funmpt 5926 |
. . . . . 6
      /𝑒    |
| 2 | | ovex 6678 |
. . . . . . . 8
     /𝑒   |
| 3 | 2 | rgenw 2924 |
. . . . . . 7

     /𝑒   |
| 4 | | dmmptg 5632 |
. . . . . . 7
 
     /𝑒        /𝑒     |
| 5 | 3, 4 | ax-mp 5 |
. . . . . 6
      /𝑒    |
| 6 | | df-fn 5891 |
. . . . . 6
       /𝑒          /𝑒        
/𝑒      |
| 7 | 1, 5, 6 | mpbir2an 955 |
. . . . 5
      /𝑒    |
| 8 | 7 | a1i 11 |
. . . 4
  measures 


     /𝑒     |
| 9 | | vex 3203 |
. . . . . . 7
 |
| 10 | | eqid 2622 |
. . . . . . . 8
      /𝑒         /𝑒    |
| 11 | 10 | elrnmpt 5372 |
. . . . . . 7
        /𝑒  

    
/𝑒     |
| 12 | 9, 11 | ax-mp 5 |
. . . . . 6
       /𝑒  

    
/𝑒    |
| 13 | | measfrge0 30266 |
. . . . . . . . . . 11
 measures 
         |
| 14 | | ffvelrn 6357 |
. . . . . . . . . . 11
        
          |
| 15 | 13, 14 | sylan 488 |
. . . . . . . . . 10
  measures 
          |
| 16 | 15 | adantlr 751 |
. . . . . . . . 9
   measures             |
| 17 | | simplr 792 |
. . . . . . . . 9
   measures      |
| 18 | 16, 17 | xrpxdivcld 29643 |
. . . . . . . 8
   measures         /𝑒       |
| 19 | | eleq1a 2696 |
. . . . . . . 8
      /𝑒           /𝑒        |
| 20 | 18, 19 | syl 17 |
. . . . . . 7
   measures          /𝑒 
      |
| 21 | 20 | rexlimdva 3031 |
. . . . . 6
  measures 

 
     /𝑒        |
| 22 | 12, 21 | syl5bi 232 |
. . . . 5
  measures 

       /𝑒  
      |
| 23 | 22 | ssrdv 3609 |
. . . 4
  measures 

      /𝑒    
   |
| 24 | | df-f 5892 |
. . . 4
       /𝑒         
       /𝑒         /𝑒  
      |
| 25 | 8, 23, 24 | sylanbrc 698 |
. . 3
  measures 


     /𝑒            |
| 26 | | measbase 30260 |
. . . . . . . 8
 measures 
 sigAlgebra |
| 27 | | 0elsiga 30177 |
. . . . . . . 8
  sigAlgebra   |
| 28 | 26, 27 | syl 17 |
. . . . . . 7
 measures 
  |
| 29 | 28 | adantr 481 |
. . . . . 6
  measures 

  |
| 30 | | ovex 6678 |
. . . . . 6
     /𝑒   |
| 31 | 29, 30 | jctir 561 |
. . . . 5
  measures 

      /𝑒     |
| 32 | | fveq2 6191 |
. . . . . . 7

          |
| 33 | 32 | oveq1d 6665 |
. . . . . 6

     /𝑒       /𝑒    |
| 34 | 33, 10 | fvmptg 6280 |
. . . . 5
 
     /𝑒          /𝑒           /𝑒    |
| 35 | 31, 34 | syl 17 |
. . . 4
  measures 

       /𝑒           /𝑒    |
| 36 | | measvnul 30269 |
. . . . . 6
 measures 
      |
| 37 | 36 | oveq1d 6665 |
. . . . 5
 measures 
     /𝑒   /𝑒    |
| 38 | | xdiv0rp 29638 |
. . . . 5

 /𝑒    |
| 39 | 37, 38 | sylan9eq 2676 |
. . . 4
  measures 

     /𝑒    |
| 40 | 35, 39 | eqtrd 2656 |
. . 3
  measures 

       /𝑒        |
| 41 | | simpll 790 |
. . . . . 6
    measures 

  
Disj    measures 
   |
| 42 | | simplr 792 |
. . . . . . 7
    measures 

  
Disj      |
| 43 | | simprl 794 |
. . . . . . 7
    measures 

  
Disj     |
| 44 | | simprr 796 |
. . . . . . 7
    measures 

  
Disj   Disj   |
| 45 | 42, 43, 44 | 3jca 1242 |
. . . . . 6
    measures 

  
Disj     Disj
   |
| 46 | 9 | a1i 11 |
. . . . . . . . 9
   measures       |
| 47 | | simplll 798 |
. . . . . . . . . 10
    measures 

   measures    |
| 48 | | simplr 792 |
. . . . . . . . . . 11
    measures 

      |
| 49 | | simpr 477 |
. . . . . . . . . . 11
    measures 

     |
| 50 | | elpwg 4166 |
. . . . . . . . . . . . 13
      |
| 51 | 9, 50 | ax-mp 5 |
. . . . . . . . . . . 12
 
  |
| 52 | | ssel2 3598 |
. . . . . . . . . . . 12
 
   |
| 53 | 51, 52 | sylanb 489 |
. . . . . . . . . . 11
  

  |
| 54 | 48, 49, 53 | syl2anc 693 |
. . . . . . . . . 10
    measures 

     |
| 55 | | measvxrge0 30268 |
. . . . . . . . . 10
  measures 
          |
| 56 | 47, 54, 55 | syl2anc 693 |
. . . . . . . . 9
    measures 

            |
| 57 | | simplr 792 |
. . . . . . . . 9
   measures    
  |
| 58 | 46, 56, 57 | esumdivc 30145 |
. . . . . . . 8
   measures     Σ*      /𝑒 
Σ*      
/𝑒    |
| 59 | 58 | 3ad2antr1 1226 |
. . . . . . 7
   measures    
Disj   Σ*      /𝑒 
Σ*      
/𝑒    |
| 60 | 26 | ad2antrr 762 |
. . . . . . . . . 10
   measures    
Disj    sigAlgebra |
| 61 | | simpr1 1067 |
. . . . . . . . . 10
   measures    
Disj      |
| 62 | | simpr2 1068 |
. . . . . . . . . 10
   measures    
Disj     |
| 63 | | sigaclcu 30180 |
. . . . . . . . . 10
   sigAlgebra

    |
| 64 | 60, 61, 62, 63 | syl3anc 1326 |
. . . . . . . . 9
   measures    
Disj      |
| 65 | | fveq2 6191 |
. . . . . . . . . . 11
             |
| 66 | 65 | oveq1d 6665 |
. . . . . . . . . 10
      
/𝑒       
/𝑒    |
| 67 | 66, 10, 2 | fvmpt3i 6287 |
. . . . . . . . 9
 
      
/𝑒            
/𝑒    |
| 68 | 64, 67 | syl 17 |
. . . . . . . 8
   measures    
Disj          /𝑒            
/𝑒    |
| 69 | | simpll 790 |
. . . . . . . . . . 11
   measures    
Disj   measures    |
| 70 | 69, 61 | jca 554 |
. . . . . . . . . 10
   measures    
Disj    measures 
    |
| 71 | | simpr3 1069 |
. . . . . . . . . . 11
   measures    
Disj   Disj   |
| 72 | 62, 71 | jca 554 |
. . . . . . . . . 10
   measures    
Disj    Disj    |
| 73 | | measvun 30272 |
. . . . . . . . . . . . 13
  measures 


Disj        Σ*        |
| 74 | 73 | 3expia 1267 |
. . . . . . . . . . . 12
  measures 
    Disj       Σ*         |
| 75 | 74 | ralrimiva 2966 |
. . . . . . . . . . 11
 measures 
   
Disj       Σ*         |
| 76 | 75 | r19.21bi 2932 |
. . . . . . . . . 10
  measures 
    Disj       Σ*         |
| 77 | 70, 72, 76 | sylc 65 |
. . . . . . . . 9
   measures    
Disj        Σ*        |
| 78 | 77 | oveq1d 6665 |
. . . . . . . 8
   measures    
Disj         /𝑒  Σ*     
/𝑒    |
| 79 | 68, 78 | eqtrd 2656 |
. . . . . . 7
   measures    
Disj          /𝑒       Σ*      /𝑒    |
| 80 | | fveq2 6191 |
. . . . . . . . . . . 12
           |
| 81 | 80 | oveq1d 6665 |
. . . . . . . . . . 11
      /𝑒       /𝑒    |
| 82 | 81, 10, 2 | fvmpt3i 6287 |
. . . . . . . . . 10
       
/𝑒           /𝑒    |
| 83 | 53, 82 | syl 17 |
. . . . . . . . 9
  

       /𝑒           /𝑒    |
| 84 | 83 | esumeq2dv 30100 |
. . . . . . . 8
  Σ*         /𝑒     
Σ*      
/𝑒    |
| 85 | 61, 84 | syl 17 |
. . . . . . 7
   measures    
Disj   Σ*        
/𝑒      Σ*       /𝑒    |
| 86 | 59, 79, 85 | 3eqtr4d 2666 |
. . . . . 6
   measures    
Disj          /𝑒       Σ*         /𝑒        |
| 87 | 41, 45, 86 | syl2anc 693 |
. . . . 5
    measures 

  
Disj          /𝑒       Σ*         /𝑒        |
| 88 | 87 | ex 450 |
. . . 4
   measures       Disj 
       /𝑒       Σ*         /𝑒         |
| 89 | 88 | ralrimiva 2966 |
. . 3
  measures 

   
Disj         /𝑒      
Σ*         /𝑒         |
| 90 | 25, 40, 89 | 3jca 1242 |
. 2
  measures 

       /𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒          |
| 91 | | ismeas 30262 |
. . . . 5
  sigAlgebra       
/𝑒   measures        
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒           |
| 92 | 26, 91 | syl 17 |
. . . 4
 measures 
       /𝑒   measures        
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒           |
| 93 | 92 | biimprd 238 |
. . 3
 measures 
       
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒             
/𝑒   measures     |
| 94 | 93 | adantr 481 |
. 2
  measures 

       
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒             
/𝑒   measures     |
| 95 | 90, 94 | mpd 15 |
1
  measures 


     /𝑒   measures    |