| Step | Hyp | Ref
| Expression |
| 1 | | simp1 1061 |
. . . . . 6
  TopOn     
 TopOn    |
| 2 | | filelss 21656 |
. . . . . . 7
         |
| 3 | 2 | 3adant1 1079 |
. . . . . 6
  TopOn     
   |
| 4 | | resttopon 20965 |
. . . . . 6
  TopOn    ↾t  TopOn    |
| 5 | 1, 3, 4 | syl2anc 693 |
. . . . 5
  TopOn     
  ↾t  TopOn    |
| 6 | | filfbas 21652 |
. . . . . . . 8
    
      |
| 7 | 6 | 3ad2ant2 1083 |
. . . . . . 7
  TopOn     
       |
| 8 | | simp3 1063 |
. . . . . . 7
  TopOn     
   |
| 9 | | fbncp 21643 |
. . . . . . 7
       
   |
| 10 | 7, 8, 9 | syl2anc 693 |
. . . . . 6
  TopOn     
 
   |
| 11 | | simp2 1062 |
. . . . . . 7
  TopOn     
       |
| 12 | | trfil3 21692 |
. . . . . . 7
        
↾t           |
| 13 | 11, 3, 12 | syl2anc 693 |
. . . . . 6
  TopOn     
  
↾t           |
| 14 | 10, 13 | mpbird 247 |
. . . . 5
  TopOn     
  ↾t        |
| 15 | | flimopn 21779 |
. . . . 5
  
↾t  TopOn   ↾t      
   ↾t   ↾t     
↾t    
↾t       |
| 16 | 5, 14, 15 | syl2anc 693 |
. . . 4
  TopOn     
    ↾t   ↾t  

 
↾t    
↾t       |
| 17 | | simpll2 1101 |
. . . . . . . . . 10
    TopOn 
   


       |
| 18 | | simpll3 1102 |
. . . . . . . . . 10
    TopOn 
   


   |
| 19 | | elrestr 16089 |
. . . . . . . . . . 11
     
 
 
↾t    |
| 20 | 19 | 3expia 1267 |
. . . . . . . . . 10
           ↾t     |
| 21 | 17, 18, 20 | syl2anc 693 |
. . . . . . . . 9
    TopOn 
   


     ↾t     |
| 22 | | trfilss 21693 |
. . . . . . . . . . . 12
        ↾t    |
| 23 | 17, 18, 22 | syl2anc 693 |
. . . . . . . . . . 11
    TopOn 
   


  ↾t    |
| 24 | 23 | sseld 3602 |
. . . . . . . . . 10
    TopOn 
   


     ↾t 
     |
| 25 | | inss1 3833 |
. . . . . . . . . . . 12
   |
| 26 | 25 | a1i 11 |
. . . . . . . . . . 11
    TopOn 
   


 
   |
| 27 | | simpl1 1064 |
. . . . . . . . . . . 12
   TopOn     
  TopOn    |
| 28 | | toponss 20731 |
. . . . . . . . . . . 12
  TopOn     |
| 29 | 27, 28 | sylan 488 |
. . . . . . . . . . 11
    TopOn 
   


   |
| 30 | | filss 21657 |
. . . . . . . . . . . . 13
         
     |
| 31 | 30 | 3exp2 1285 |
. . . . . . . . . . . 12
    
 

   
     |
| 32 | 31 | com24 95 |
. . . . . . . . . . 11
    
 


 

     |
| 33 | 17, 26, 29, 32 | syl3c 66 |
. . . . . . . . . 10
    TopOn 
   


       |
| 34 | 24, 33 | syld 47 |
. . . . . . . . 9
    TopOn 
   


     ↾t 
   |
| 35 | 21, 34 | impbid 202 |
. . . . . . . 8
    TopOn 
   


 
   ↾t     |
| 36 | 35 | imbi2d 330 |
. . . . . . 7
    TopOn 
   


    
   ↾t      |
| 37 | 36 | ralbidva 2985 |
. . . . . 6
   TopOn     
   

 

   ↾t      |
| 38 | | simpl2 1065 |
. . . . . . 7
   TopOn     
        |
| 39 | 3 | sselda 3603 |
. . . . . . 7
   TopOn     
    |
| 40 | | flimopn 21779 |
. . . . . . . 8
  TopOn         



     |
| 41 | 40 | baibd 948 |
. . . . . . 7
   TopOn          


    |
| 42 | 27, 38, 39, 41 | syl21anc 1325 |
. . . . . 6
   TopOn     
    


    |
| 43 | | vex 3203 |
. . . . . . . . 9
 |
| 44 | 43 | inex1 4799 |
. . . . . . . 8
   |
| 45 | 44 | a1i 11 |
. . . . . . 7
    TopOn 
   


 
   |
| 46 | | simpl3 1066 |
. . . . . . . 8
   TopOn     
    |
| 47 | | elrest 16088 |
. . . . . . . 8
  TopOn     ↾t  
     |
| 48 | 27, 46, 47 | syl2anc 693 |
. . . . . . 7
   TopOn     
    ↾t  
     |
| 49 | | eleq2 2690 |
. . . . . . . . 9
   
     |
| 50 | | elin 3796 |
. . . . . . . . . . 11
  

   |
| 51 | 50 | rbaib 947 |
. . . . . . . . . 10
   
   |
| 52 | 51 | adantl 482 |
. . . . . . . . 9
   TopOn     
    
   |
| 53 | 49, 52 | sylan9bbr 737 |
. . . . . . . 8
    TopOn 
   


   
   |
| 54 | | eleq1 2689 |
. . . . . . . . 9
     ↾t     ↾t     |
| 55 | 54 | adantl 482 |
. . . . . . . 8
    TopOn 
   


     ↾t     ↾t     |
| 56 | 53, 55 | imbi12d 334 |
. . . . . . 7
    TopOn 
   


      ↾t  

  
↾t      |
| 57 | 45, 48, 56 | ralxfr2d 4882 |
. . . . . 6
   TopOn     
   
 ↾t    
↾t  


  
↾t      |
| 58 | 37, 42, 57 | 3bitr4d 300 |
. . . . 5
   TopOn     
    
 
↾t    
↾t      |
| 59 | 58 | pm5.32da 673 |
. . . 4
  TopOn     
  
      ↾t    
↾t       |
| 60 | 16, 59 | bitr4d 271 |
. . 3
  TopOn     
    ↾t   ↾t  

      |
| 61 | | ancom 466 |
. . . 4
 
  
  
   |
| 62 | | elin 3796 |
. . . 4
       
   |
| 63 | 61, 62 | bitr4i 267 |
. . 3
 
  
      |
| 64 | 60, 63 | syl6bb 276 |
. 2
  TopOn     
    ↾t   ↾t  
       |
| 65 | 64 | eqrdv 2620 |
1
  TopOn     
  
↾t   ↾t         |