Proof of Theorem ufileulem
| Step | Hyp | Ref
| Expression |
| 1 | | snex 3492 |
. . . . 5
   |
| 2 | | unexg 3798 |
. . . . 5
  Fil    
     |
| 3 | 1, 2 | mpan2 760 |
. . . 4
 Fil

     |
| 4 | | fsubbas 10281 |
. . . 4
      fi       fBas      fi           |
| 5 | 3, 4 | syl 12 |
. . 3
 Fil
 fi       fBas      fi           |
| 6 | 5 | ad2antrr 440 |
. 2
   Fil 

     fi       fBas      fi           |
| 7 | | ufileu.1 |
. . . . 5
  |
| 8 | 7 | filusb 10267 |
. . . 4
 Fil
  |
| 9 | | ne0i 2881 |
. . . 4

  |
| 10 | | ssun1 2767 |
. . . . 5
     |
| 11 | | ssn0 2905 |
. . . . 5
  
    
     |
| 12 | 10, 11 | mpan 759 |
. . . 4


     |
| 13 | 8, 9, 12 | 3syl 24 |
. . 3
 Fil

     |
| 14 | 13 | ad2antrr 440 |
. 2
   Fil 

    
     |
| 15 | | ineq2 2790 |
. . . . . . . . . 10
       |
| 16 | 15 | neeq1d 2028 |
. . . . . . . . 9
         |
| 17 | 16 | imbi2d 674 |
. . . . . . . 8
       
     |
| 18 | | elssuni 3206 |
. . . . . . . . . . . . . . . . 17

   |
| 19 | 18, 7 | syl6ssr 2664 |
. . . . . . . . . . . . . . . 16

  |
| 20 | | reldisj 2916 |
. . . . . . . . . . . . . . . 16
         |
| 21 | 19, 20 | syl 12 |
. . . . . . . . . . . . . . 15

        |
| 22 | 21 | adantl 424 |
. . . . . . . . . . . . . 14
   Fil 
         |
| 23 | | difss 2735 |
. . . . . . . . . . . . . . . 16

  |
| 24 | 7 | fillsb 10270 |
. . . . . . . . . . . . . . . . . 18
 Fil
   
        |
| 25 | 24 | 3expd 1085 |
. . . . . . . . . . . . . . . . 17
 Fil

    
        |
| 26 | 25 | imp 377 |
. . . . . . . . . . . . . . . 16
  Fil
     
       |
| 27 | 23, 26 | mpi 55 |
. . . . . . . . . . . . . . 15
  Fil
  
      |
| 28 | 27 | adantlr 429 |
. . . . . . . . . . . . . 14
   Fil 
    
    |
| 29 | 22, 28 | sylbid 220 |
. . . . . . . . . . . . 13
   Fil 
         |
| 30 | 29 | necon3bd 2039 |
. . . . . . . . . . . 12
   Fil 
         |
| 31 | 30 | ex 402 |
. . . . . . . . . . 11
  Fil      
     |
| 32 | 31 | com23 36 |
. . . . . . . . . 10
  Fil      
     |
| 33 | 32 | imp 377 |
. . . . . . . . 9
   Fil 

        |
| 34 | 33 | adantrl 430 |
. . . . . . . 8
   Fil 

    
     |
| 35 | 17, 34 | syl5cbir 228 |
. . . . . . 7
   Fil 

            |
| 36 | 35 | com23 36 |
. . . . . 6
   Fil 

    
       |
| 37 | | elsn 3058 |
. . . . . 6
     |
| 38 | 36, 37 | syl7ib 233 |
. . . . 5
   Fil 

    
   
     |
| 39 | 38 | imp3a 388 |
. . . 4
   Fil 

              |
| 40 | 39 | r19.21aivv 2183 |
. . 3
   Fil 

    

      |
| 41 | | filfbas 10276 |
. . . . 5
 Fil
fBas |
| 42 | 41 | ad2antrr 440 |
. . . 4
   Fil 

    fBas |
| 43 | | visset 2295 |
. . . . . . 7
 |
| 44 | 43 | a1i 8 |
. . . . . 6
   Fil 

      |
| 45 | | difeq2 2719 |
. . . . . . . . . . . 12
       |
| 46 | 45 | eleq1d 1963 |
. . . . . . . . . . 11
         |
| 47 | | dif0 2943 |
. . . . . . . . . . . 12

  |
| 48 | 8, 47 | syl5eqel 1975 |
. . . . . . . . . . 11
 Fil

   |
| 49 | 46, 48 | syl5cbir 228 |
. . . . . . . . . 10
 Fil
      |
| 50 | 49 | adantr 425 |
. . . . . . . . 9
  Fil        |
| 51 | 50 | necon3bd 2039 |
. . . . . . . 8
  Fil        |
| 52 | 51 | imp 377 |
. . . . . . 7
   Fil 

    |
| 53 | 52 | adantrl 430 |
. . . . . 6
   Fil 

      |
| 54 | | oefil2 10275 |
. . . . . 6
  
 
Fil |
| 55 | 44, 53, 54 | syl11anc 524 |
. . . . 5
   Fil 

      Fil |
| 56 | | filfbas 10276 |
. . . . 5
   Fil   fBas |
| 57 | 55, 56 | syl 12 |
. . . 4
   Fil 

      fBas |
| 58 | | fbunfip 10282 |
. . . 4
  fBas   fBas
 fi
 
     
       |
| 59 | 42, 57, 58 | syl11anc 524 |
. . 3
   Fil 

     fi  
     
       |
| 60 | 40, 59 | mpbird 213 |
. 2
   Fil 

    fi         |
| 61 | 6, 14, 60 | mpbir2and 802 |
1
   Fil 

    fi       fBas |