| Step | Hyp | Ref
| Expression |
| 1 | | ofcfval3 30164 |
. . 3
  measures 

 ∘𝑓/𝑐
/𝑒       
/𝑒     |
| 2 | | measfrge0 30266 |
. . . . . 6
 measures 
         |
| 3 | | fdm 6051 |
. . . . . 6
          |
| 4 | 2, 3 | syl 17 |
. . . . 5
 measures 
  |
| 5 | 4 | adantr 481 |
. . . 4
  measures 

  |
| 6 | 5 | mpteq1d 4738 |
. . 3
  measures 

      /𝑒         /𝑒     |
| 7 | 1, 6 | eqtrd 2656 |
. 2
  measures 

 ∘𝑓/𝑐
/𝑒        /𝑒     |
| 8 | | measvxrge0 30268 |
. . . . . 6
  measures 
          |
| 9 | 8 | adantlr 751 |
. . . . 5
   measures             |
| 10 | | simplr 792 |
. . . . 5
   measures      |
| 11 | 9, 10 | xrpxdivcld 29643 |
. . . 4
   measures         /𝑒       |
| 12 | | eqid 2622 |
. . . 4
      /𝑒         /𝑒    |
| 13 | 11, 12 | fmptd 6385 |
. . 3
  measures 


     /𝑒            |
| 14 | | measbase 30260 |
. . . . . . 7
 measures 
 sigAlgebra |
| 15 | | 0elsiga 30177 |
. . . . . . 7
  sigAlgebra   |
| 16 | 14, 15 | syl 17 |
. . . . . 6
 measures 
  |
| 17 | 16 | adantr 481 |
. . . . 5
  measures 

  |
| 18 | | ovex 6678 |
. . . . 5
     /𝑒   |
| 19 | | fveq2 6191 |
. . . . . . 7

          |
| 20 | 19 | oveq1d 6665 |
. . . . . 6

     /𝑒       /𝑒    |
| 21 | 20, 12 | fvmptg 6280 |
. . . . 5
 
     /𝑒          /𝑒           /𝑒    |
| 22 | 17, 18, 21 | sylancl 694 |
. . . 4
  measures 

       /𝑒           /𝑒    |
| 23 | | measvnul 30269 |
. . . . . 6
 measures 
      |
| 24 | 23 | oveq1d 6665 |
. . . . 5
 measures 
     /𝑒   /𝑒    |
| 25 | | xdiv0rp 29638 |
. . . . 5

 /𝑒    |
| 26 | 24, 25 | sylan9eq 2676 |
. . . 4
  measures 

     /𝑒    |
| 27 | 22, 26 | eqtrd 2656 |
. . 3
  measures 

       /𝑒        |
| 28 | | simpll 790 |
. . . . . 6
    measures 

  
Disj    measures 
   |
| 29 | | simplr 792 |
. . . . . 6
    measures 

  
Disj      |
| 30 | | simprl 794 |
. . . . . 6
    measures 

  
Disj     |
| 31 | | simprr 796 |
. . . . . 6
    measures 

  
Disj   Disj   |
| 32 | | vex 3203 |
. . . . . . . . . 10
 |
| 33 | 32 | a1i 11 |
. . . . . . . . 9
   measures       |
| 34 | | simplll 798 |
. . . . . . . . . 10
    measures 

   measures    |
| 35 | | selpw 4165 |
. . . . . . . . . . . 12
 
  |
| 36 | | ssel2 3598 |
. . . . . . . . . . . 12
 
   |
| 37 | 35, 36 | sylanb 489 |
. . . . . . . . . . 11
  

  |
| 38 | 37 | adantll 750 |
. . . . . . . . . 10
    measures 

     |
| 39 | | measvxrge0 30268 |
. . . . . . . . . 10
  measures 
          |
| 40 | 34, 38, 39 | syl2anc 693 |
. . . . . . . . 9
    measures 

            |
| 41 | | simplr 792 |
. . . . . . . . 9
   measures    
  |
| 42 | 33, 40, 41 | esumdivc 30145 |
. . . . . . . 8
   measures     Σ*      /𝑒 
Σ*      
/𝑒    |
| 43 | 42 | 3ad2antr1 1226 |
. . . . . . 7
   measures    
Disj   Σ*      /𝑒 
Σ*      
/𝑒    |
| 44 | 14 | ad2antrr 762 |
. . . . . . . . . 10
   measures    
Disj    sigAlgebra |
| 45 | | simpr1 1067 |
. . . . . . . . . 10
   measures    
Disj      |
| 46 | | simpr2 1068 |
. . . . . . . . . 10
   measures    
Disj     |
| 47 | | sigaclcu 30180 |
. . . . . . . . . 10
   sigAlgebra

    |
| 48 | 44, 45, 46, 47 | syl3anc 1326 |
. . . . . . . . 9
   measures    
Disj      |
| 49 | | fveq2 6191 |
. . . . . . . . . . 11
             |
| 50 | 49 | oveq1d 6665 |
. . . . . . . . . 10
      
/𝑒       
/𝑒    |
| 51 | | ovex 6678 |
. . . . . . . . . 10
     /𝑒   |
| 52 | 50, 12, 51 | fvmpt3i 6287 |
. . . . . . . . 9
 
      
/𝑒            
/𝑒    |
| 53 | 48, 52 | syl 17 |
. . . . . . . 8
   measures    
Disj          /𝑒            
/𝑒    |
| 54 | | simpll 790 |
. . . . . . . . . 10
   measures    
Disj   measures    |
| 55 | | simpr3 1069 |
. . . . . . . . . 10
   measures    
Disj   Disj   |
| 56 | | measvun 30272 |
. . . . . . . . . 10
  measures 


Disj        Σ*        |
| 57 | 54, 45, 46, 55, 56 | syl112anc 1330 |
. . . . . . . . 9
   measures    
Disj        Σ*        |
| 58 | 57 | oveq1d 6665 |
. . . . . . . 8
   measures    
Disj         /𝑒  Σ*     
/𝑒    |
| 59 | 53, 58 | eqtrd 2656 |
. . . . . . 7
   measures    
Disj          /𝑒       Σ*      /𝑒    |
| 60 | | fveq2 6191 |
. . . . . . . . . . . 12
           |
| 61 | 60 | oveq1d 6665 |
. . . . . . . . . . 11
      /𝑒       /𝑒    |
| 62 | 61, 12, 51 | fvmpt3i 6287 |
. . . . . . . . . 10
       
/𝑒           /𝑒    |
| 63 | 37, 62 | syl 17 |
. . . . . . . . 9
  

       /𝑒           /𝑒    |
| 64 | 63 | esumeq2dv 30100 |
. . . . . . . 8
  Σ*         /𝑒     
Σ*      
/𝑒    |
| 65 | 45, 64 | syl 17 |
. . . . . . 7
   measures    
Disj   Σ*        
/𝑒      Σ*       /𝑒    |
| 66 | 43, 59, 65 | 3eqtr4d 2666 |
. . . . . 6
   measures    
Disj          /𝑒       Σ*         /𝑒        |
| 67 | 28, 29, 30, 31, 66 | syl13anc 1328 |
. . . . 5
    measures 

  
Disj          /𝑒       Σ*         /𝑒        |
| 68 | 67 | ex 450 |
. . . 4
   measures       Disj 
       /𝑒       Σ*         /𝑒         |
| 69 | 68 | ralrimiva 2966 |
. . 3
  measures 

   
Disj         /𝑒      
Σ*         /𝑒         |
| 70 | | ismeas 30262 |
. . . . . 6
  sigAlgebra       
/𝑒   measures        
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒           |
| 71 | 14, 70 | syl 17 |
. . . . 5
 measures 
       /𝑒   measures        
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒           |
| 72 | 71 | biimprd 238 |
. . . 4
 measures 
       
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒             
/𝑒   measures     |
| 73 | 72 | adantr 481 |
. . 3
  measures 

       
/𝑒         
      
/𝑒         
Disj        
/𝑒       Σ*         /𝑒             
/𝑒   measures     |
| 74 | 13, 27, 69, 73 | mp3and 1427 |
. 2
  measures 


     /𝑒   measures    |
| 75 | 7, 74 | eqeltrd 2701 |
1
  measures 

 ∘𝑓/𝑐
/𝑒  measures    |