| Step | Hyp | Ref
| Expression |
| 1 | | isrnsigau 30190 |
. . . . . . . 8
  sigAlgebra      
     
      |
| 2 | 1 | simprd 479 |
. . . . . . 7
  sigAlgebra  
            |
| 3 | 2 | simp2d 1074 |
. . . . . 6
  sigAlgebra 
     |
| 4 | 3 | adantr 481 |
. . . . 5
   sigAlgebra
 

     |
| 5 | | elpwi 4168 |
. . . . . . . . . . . 12
    |
| 6 | | ssrexv 3667 |
. . . . . . . . . . . 12
  
   
      |
| 7 | 5, 6 | syl 17 |
. . . . . . . . . . 11
      

      |
| 8 | 7 | ss2abdv 3675 |
. . . . . . . . . 10
   
     
      |
| 9 | | isrnsigau 30190 |
. . . . . . . . . . . . 13
  sigAlgebra      
     
      |
| 10 | 9 | simprd 479 |
. . . . . . . . . . . 12
  sigAlgebra  
            |
| 11 | 10 | simp2d 1074 |
. . . . . . . . . . 11
  sigAlgebra 
     |
| 12 | | uniiunlem 3691 |
. . . . . . . . . . . 12
 
 
       
       |
| 13 | 11, 12 | syl 17 |
. . . . . . . . . . 11
  sigAlgebra  
  
 
       |
| 14 | 11, 13 | mpbid 222 |
. . . . . . . . . 10
  sigAlgebra         |
| 15 | 8, 14 | sylan9ssr 3617 |
. . . . . . . . 9
   sigAlgebra
 
 
      |
| 16 | | abrexexg 7140 |
. . . . . . . . . . 11
   
      |
| 17 | | elpwg 4166 |
. . . . . . . . . . 11
  
      
    
 
       |
| 18 | 16, 17 | syl 17 |
. . . . . . . . . 10
    
    
 
       |
| 19 | 18 | adantl 482 |
. . . . . . . . 9
   sigAlgebra
 
  
      
       |
| 20 | 15, 19 | mpbird 247 |
. . . . . . . 8
   sigAlgebra
 
 
       |
| 21 | 2 | simp3d 1075 |
. . . . . . . . 9
  sigAlgebra   
    |
| 22 | 21 | adantr 481 |
. . . . . . . 8
   sigAlgebra
 
  
    |
| 23 | 20, 22 | jca 554 |
. . . . . . 7
   sigAlgebra
 
  
       
     |
| 24 | | abrexdom2jm 29346 |
. . . . . . . . . 10
   
      |
| 25 | | domtr 8009 |
. . . . . . . . . 10
   
             |
| 26 | 24, 25 | sylan 488 |
. . . . . . . . 9
  
  
      |
| 27 | 26 | ex 450 |
. . . . . . . 8
    
       |
| 28 | 27 | adantl 482 |
. . . . . . 7
   sigAlgebra
 
  
       |
| 29 | | breq1 4656 |
. . . . . . . . 9
  
      
       |
| 30 | | unieq 4444 |
. . . . . . . . . 10
  
       
      |
| 31 | 30 | eleq1d 2686 |
. . . . . . . . 9
  
     
  
       |
| 32 | 29, 31 | imbi12d 334 |
. . . . . . . 8
  
     
 
  
      
        |
| 33 | 32 | rspcva 3307 |
. . . . . . 7
   
    
  
     
   
          |
| 34 | 23, 28, 33 | sylsyld 61 |
. . . . . 6
   sigAlgebra
 
   
       |
| 35 | 5 | adantl 482 |
. . . . . . . 8
   sigAlgebra
 
  |
| 36 | 11 | adantr 481 |
. . . . . . . 8
   sigAlgebra
 

     |
| 37 | | ssralv 3666 |
. . . . . . . 8
  
   
      |
| 38 | 35, 36, 37 | sylc 65 |
. . . . . . 7
   sigAlgebra
 

     |
| 39 | | dfiun2g 4552 |
. . . . . . 7
 
 
 
     
      |
| 40 | | eleq1 2689 |
. . . . . . 7
 
 
   
     
  
          |
| 41 | 38, 39, 40 | 3syl 18 |
. . . . . 6
   sigAlgebra
 
 
 

          |
| 42 | 34, 41 | sylibrd 249 |
. . . . 5
   sigAlgebra
 
        |
| 43 | | difeq2 3722 |
. . . . . . 7
      
          |
| 44 | 43 | eleq1d 2686 |
. . . . . 6
           
 
     |
| 45 | 44 | rspccv 3306 |
. . . . 5
 
 
        
       |
| 46 | 4, 42, 45 | sylsyld 61 |
. . . 4
   sigAlgebra
 
           |
| 47 | 46 | adantrd 484 |
. . 3
   sigAlgebra
 
 

          |
| 48 | 47 | imp 445 |
. 2
    sigAlgebra
  
   

      |
| 49 | | simpr 477 |
. . . . . 6
   sigAlgebra
 
   |
| 50 | | pwuni 4474 |
. . . . . . 7
   |
| 51 | 5, 50 | syl6ss 3615 |
. . . . . 6
      |
| 52 | | iundifdifd 29380 |
. . . . . 6
               |
| 53 | 49, 51, 52 | 3syl 18 |
. . . . 5
   sigAlgebra
 

   
       |
| 54 | 53 | adantld 483 |
. . . 4
   sigAlgebra
 
 

           |
| 55 | | eleq1 2689 |
. . . 4
 
           
 
     |
| 56 | 54, 55 | syl6 35 |
. . 3
   sigAlgebra
 
 

 
           |
| 57 | 56 | imp 445 |
. 2
    sigAlgebra
  
   
          |
| 58 | 48, 57 | mpbird 247 |
1
    sigAlgebra
  
     |