| Step | Hyp | Ref
| Expression |
| 1 | | cnextf.1 |
. . . . 5
  |
| 2 | | cnextf.2 |
. . . . 5
  |
| 3 | | cnextf.3 |
. . . . 5
   |
| 4 | | cnextf.4 |
. . . . 5
   |
| 5 | | cnextf.5 |
. . . . 5
       |
| 6 | | cnextf.a |
. . . . 5

  |
| 7 | | cnextf.6 |
. . . . 5
           |
| 8 | | cnextf.7 |
. . . . 5
 
             
↾t        |
| 9 | 1, 2, 3, 4, 5, 6, 7, 8 | cnextf 21870 |
. . . 4
   CnExt          |
| 10 | | ffn 6045 |
. . . 4
   CnExt          CnExt      |
| 11 | 9, 10 | syl 17 |
. . 3
   CnExt      |
| 12 | | fnssres 6004 |
. . 3
    CnExt   
    CnExt       |
| 13 | 11, 6, 12 | syl2anc 693 |
. 2
    CnExt       |
| 14 | | ffn 6045 |
. . 3
    
  |
| 15 | 5, 14 | syl 17 |
. 2
   |
| 16 | | fvres 6207 |
. . . 4
     CnExt           CnExt         |
| 17 | 16 | adantl 482 |
. . 3
 
     CnExt           CnExt         |
| 18 | 6 | sselda 3603 |
. . . 4
 
   |
| 19 | 1, 2, 3, 4, 5, 6, 7, 8 | cnextfvval 21869 |
. . . 4
 
    CnExt                    
↾t        |
| 20 | 18, 19 | syldan 487 |
. . 3
 
    CnExt                    
↾t        |
| 21 | 5 | ffvelrnda 6359 |
. . . . . . 7
 
       |
| 22 | | simpr 477 |
. . . . . . . . . . . 12
 
   |
| 23 | 1 | restuni 20966 |
. . . . . . . . . . . . . 14
  
  ↾t    |
| 24 | 3, 6, 23 | syl2anc 693 |
. . . . . . . . . . . . 13
   ↾t    |
| 25 | 24 | adantr 481 |
. . . . . . . . . . . 12
 
   ↾t    |
| 26 | 22, 25 | eleqtrd 2703 |
. . . . . . . . . . 11
 
   ↾t    |
| 27 | | cnextfres1.1 |
. . . . . . . . . . . . 13
   ↾t     |
| 28 | | fvex 6201 |
. . . . . . . . . . . . . . . . 17
         |
| 29 | 7, 28 | syl6eqelr 2710 |
. . . . . . . . . . . . . . . 16
   |
| 30 | 29, 6 | ssexd 4805 |
. . . . . . . . . . . . . . 15
   |
| 31 | | resttop 20964 |
. . . . . . . . . . . . . . 15
 
 
↾t    |
| 32 | 3, 30, 31 | syl2anc 693 |
. . . . . . . . . . . . . 14
 
↾t    |
| 33 | | haustop 21135 |
. . . . . . . . . . . . . . 15

  |
| 34 | 4, 33 | syl 17 |
. . . . . . . . . . . . . 14
   |
| 35 | 24 | feq2d 6031 |
. . . . . . . . . . . . . . 15
          ↾t       |
| 36 | 5, 35 | mpbid 222 |
. . . . . . . . . . . . . 14
     ↾t      |
| 37 | | eqid 2622 |
. . . . . . . . . . . . . . 15
  ↾t   
↾t   |
| 38 | 37, 2 | cnnei 21086 |
. . . . . . . . . . . . . 14
  
↾t      ↾t       
↾t     
↾t                         ↾t            
   |
| 39 | 32, 34, 36, 38 | syl3anc 1326 |
. . . . . . . . . . . . 13
   
↾t     
↾t                         ↾t            
   |
| 40 | 27, 39 | mpbid 222 |
. . . . . . . . . . . 12
   
↾t                         ↾t            
  |
| 41 | 40 | r19.21bi 2932 |
. . . . . . . . . . 11
 
 
↾t   
                     ↾t            
  |
| 42 | 26, 41 | syldan 487 |
. . . . . . . . . 10
 
                       ↾t            
  |
| 43 | 42 | r19.21bi 2932 |
. . . . . . . . 9
                   
     ↾t            
  |
| 44 | 3 | adantr 481 |
. . . . . . . . . . . 12
 
   |
| 45 | 6 | adantr 481 |
. . . . . . . . . . . 12
 
   |
| 46 | | snssi 4339 |
. . . . . . . . . . . . 13
  
  |
| 47 | 46 | adantl 482 |
. . . . . . . . . . . 12
 
  
  |
| 48 | 1 | neitr 20984 |
. . . . . . . . . . . 12
    
     ↾t                  
↾t    |
| 49 | 44, 45, 47, 48 | syl3anc 1326 |
. . . . . . . . . . 11
 
      ↾t                   ↾t    |
| 50 | 49 | rexeqdv 3145 |
. . . . . . . . . 10
 
  
     ↾t            
            ↾t      
   |
| 51 | 50 | adantr 481 |
. . . . . . . . 9
                          ↾t            
            ↾t      
   |
| 52 | 43, 51 | mpbid 222 |
. . . . . . . 8
                   
          
↾t         |
| 53 | 52 | ralrimiva 2966 |
. . . . . . 7
 
                             ↾t      
  |
| 54 | 4 | adantr 481 |
. . . . . . . . 9
 
   |
| 55 | 2 | toptopon 20722 |
. . . . . . . . . 10

TopOn    |
| 56 | 55 | biimpi 206 |
. . . . . . . . 9
 TopOn    |
| 57 | 54, 33, 56 | 3syl 18 |
. . . . . . . 8
 
 TopOn    |
| 58 | 7 | adantr 481 |
. . . . . . . . . 10
 
           |
| 59 | 18, 58 | eleqtrrd 2704 |
. . . . . . . . 9
 
           |
| 60 | 1 | toptopon 20722 |
. . . . . . . . . . . 12

TopOn    |
| 61 | 3, 60 | sylib 208 |
. . . . . . . . . . 11
 TopOn    |
| 62 | 61 | adantr 481 |
. . . . . . . . . 10
 
 TopOn    |
| 63 | | trnei 21696 |
. . . . . . . . . 10
  TopOn           
          
↾t         |
| 64 | 62, 45, 18, 63 | syl3anc 1326 |
. . . . . . . . 9
 
         
          
↾t         |
| 65 | 59, 64 | mpbid 222 |
. . . . . . . 8
 
           
↾t        |
| 66 | 5 | adantr 481 |
. . . . . . . 8
 
       |
| 67 | | flfnei 21795 |
. . . . . . . 8
  TopOn            
↾t                 
          
↾t     
    
                            ↾t      
    |
| 68 | 57, 65, 66, 67 | syl3anc 1326 |
. . . . . . 7
 
       
          
↾t     
    
                            ↾t      
    |
| 69 | 21, 53, 68 | mpbir2and 957 |
. . . . . 6
 
                 
↾t        |
| 70 | | eleq1 2689 |
. . . . . . . . . . 11
 
   |
| 71 | 70 | anbi2d 740 |
. . . . . . . . . 10
  

     |
| 72 | | sneq 4187 |
. . . . . . . . . . . . . . 15
  
    |
| 73 | 72 | fveq2d 6195 |
. . . . . . . . . . . . . 14
                       |
| 74 | 73 | oveq1d 6665 |
. . . . . . . . . . . . 13
           
↾t            
↾t    |
| 75 | 74 | oveq2d 6666 |
. . . . . . . . . . . 12
             ↾t              
↾t     |
| 76 | 75 | fveq1d 6193 |
. . . . . . . . . . 11
             
↾t                  
↾t        |
| 77 | 76 | neeq1d 2853 |
. . . . . . . . . 10
              
↾t     
             ↾t         |
| 78 | 71, 77 | imbi12d 334 |
. . . . . . . . 9
   
             
↾t      
  
             ↾t          |
| 79 | 78, 8 | chvarv 2263 |
. . . . . . . 8
 
             
↾t        |
| 80 | 18, 79 | syldan 487 |
. . . . . . 7
 
             
↾t        |
| 81 | 2 | hausflf2 21802 |
. . . . . . 7
              ↾t     
                 
↾t                   
↾t        |
| 82 | 54, 65, 66, 80, 81 | syl31anc 1329 |
. . . . . 6
 
             
↾t        |
| 83 | | en1eqsn 8190 |
. . . . . 6
       
          
↾t                  
↾t                    ↾t              |
| 84 | 69, 82, 83 | syl2anc 693 |
. . . . 5
 
             
↾t              |
| 85 | 84 | unieqd 4446 |
. . . 4
 
              
↾t               |
| 86 | | fvex 6201 |
. . . . 5
     |
| 87 | 86 | unisn 4451 |
. . . 4
            |
| 88 | 85, 87 | syl6eq 2672 |
. . 3
 
              
↾t            |
| 89 | 17, 20, 88 | 3eqtrd 2660 |
. 2
 
     CnExt              |
| 90 | 13, 15, 89 | eqfnfvd 6314 |
1
    CnExt       |