| Step | Hyp | Ref
| Expression |
| 1 | | cvmtop1 31242 |
. . . . . 6
  CovMap 
  |
| 2 | 1 | 3ad2ant1 1082 |
. . . . 5
   CovMap     
   |
| 3 | | cvmcov.1 |
. . . . . . . 8
                       
    ↾t    
↾t        |
| 4 | 3 | cvmsuni 31251 |
. . . . . . 7
             |
| 5 | 4 | 3ad2ant2 1083 |
. . . . . 6
   CovMap     
         |
| 6 | 3 | cvmsss 31249 |
. . . . . . . 8
       |
| 7 | 6 | 3ad2ant2 1083 |
. . . . . . 7
   CovMap     
   |
| 8 | 7 | unissd 4462 |
. . . . . 6
   CovMap     
     |
| 9 | 5, 8 | eqsstr3d 3640 |
. . . . 5
   CovMap     
         |
| 10 | | eqid 2622 |
. . . . . 6
   |
| 11 | 10 | restuni 20966 |
. . . . 5
               
↾t         |
| 12 | 2, 9, 11 | syl2anc 693 |
. . . 4
   CovMap     
        ↾t         |
| 13 | 12 | difeq1d 3727 |
. . 3
   CovMap     
        
       ↾t               |
| 14 | | unisng 4452 |
. . . . . . 7
   
  |
| 15 | 14 | 3ad2ant3 1084 |
. . . . . 6
   CovMap     
   
  |
| 16 | 15 | uneq2d 3767 |
. . . . 5
   CovMap     
                    |
| 17 | | uniun 4456 |
. . . . . 6
                    |
| 18 | | undif1 4043 |
. . . . . . . . 9
             |
| 19 | | simp3 1063 |
. . . . . . . . . . 11
   CovMap     
   |
| 20 | 19 | snssd 4340 |
. . . . . . . . . 10
   CovMap     
     |
| 21 | | ssequn2 3786 |
. . . . . . . . . 10
         |
| 22 | 20, 21 | sylib 208 |
. . . . . . . . 9
   CovMap     
 
     |
| 23 | 18, 22 | syl5eq 2668 |
. . . . . . . 8
   CovMap     
           |
| 24 | 23 | unieqd 4446 |
. . . . . . 7
   CovMap     
             |
| 25 | 24, 5 | eqtrd 2656 |
. . . . . 6
   CovMap     
                 |
| 26 | 17, 25 | syl5eqr 2670 |
. . . . 5
   CovMap     
                  |
| 27 | 16, 26 | eqtr3d 2658 |
. . . 4
   CovMap     
               |
| 28 | | difss 3737 |
. . . . . . 7
   
 |
| 29 | 28 | unissi 4461 |
. . . . . 6
    
  |
| 30 | 29, 5 | syl5sseq 3653 |
. . . . 5
   CovMap     
     
       |
| 31 | | uniiun 4573 |
. . . . . . . 8
            |
| 32 | 31 | ineq2i 3811 |
. . . . . . 7
                |
| 33 | | incom 3805 |
. . . . . . 7
  
            |
| 34 | | iunin2 4584 |
. . . . . . 7
         
       |
| 35 | 32, 33, 34 | 3eqtr4i 2654 |
. . . . . 6
  
             |
| 36 | | eldifsn 4317 |
. . . . . . . . . 10
    

   |
| 37 | | nesym 2850 |
. . . . . . . . . . . 12

  |
| 38 | 3 | cvmsdisj 31252 |
. . . . . . . . . . . . . 14
     
       |
| 39 | 38 | 3expa 1265 |
. . . . . . . . . . . . 13
       
 

    |
| 40 | 39 | ord 392 |
. . . . . . . . . . . 12
       
 
     |
| 41 | 37, 40 | syl5bi 232 |
. . . . . . . . . . 11
       
       |
| 42 | 41 | impr 649 |
. . . . . . . . . 10
       

      |
| 43 | 36, 42 | sylan2b 492 |
. . . . . . . . 9
       

        |
| 44 | 43 | iuneq2dv 4542 |
. . . . . . . 8
     
                 |
| 45 | 44 | 3adant1 1079 |
. . . . . . 7
   CovMap     
                 |
| 46 | | iun0 4576 |
. . . . . . 7
       |
| 47 | 45, 46 | syl6eq 2672 |
. . . . . 6
   CovMap     
           |
| 48 | 35, 47 | syl5eq 2668 |
. . . . 5
   CovMap     
          |
| 49 | | uneqdifeq 4057 |
. . . . 5
                 
              
               |
| 50 | 30, 48, 49 | syl2anc 693 |
. . . 4
   CovMap     
             
               |
| 51 | 27, 50 | mpbid 222 |
. . 3
   CovMap     
        
      |
| 52 | 13, 51 | eqtr3d 2658 |
. 2
   CovMap     
   
↾t               |
| 53 | | uniexg 6955 |
. . . . . 6
        |
| 54 | 53 | 3ad2ant2 1083 |
. . . . 5
   CovMap     
    |
| 55 | 5, 54 | eqeltrrd 2702 |
. . . 4
   CovMap     
        |
| 56 | | resttop 20964 |
. . . 4
        
↾t         |
| 57 | 2, 55, 56 | syl2anc 693 |
. . 3
   CovMap     
  ↾t         |
| 58 | | elssuni 4467 |
. . . . . . . . . . 11
    |
| 59 | 58 | adantl 482 |
. . . . . . . . . 10
    CovMap 
         |
| 60 | 5 | adantr 481 |
. . . . . . . . . 10
    CovMap 
              |
| 61 | 59, 60 | sseqtrd 3641 |
. . . . . . . . 9
    CovMap 
             |
| 62 | | df-ss 3588 |
. . . . . . . . 9
     
         |
| 63 | 61, 62 | sylib 208 |
. . . . . . . 8
    CovMap 
      
        |
| 64 | 2 | adantr 481 |
. . . . . . . . 9
    CovMap 
        |
| 65 | 55 | adantr 481 |
. . . . . . . . 9
    CovMap 
             |
| 66 | 7 | sselda 3603 |
. . . . . . . . 9
    CovMap 
        |
| 67 | | elrestr 16089 |
. . . . . . . . 9
        
       ↾t         |
| 68 | 64, 65, 66, 67 | syl3anc 1326 |
. . . . . . . 8
    CovMap 
      
       ↾t         |
| 69 | 63, 68 | eqeltrrd 2702 |
. . . . . . 7
    CovMap 
      
↾t         |
| 70 | 69 | ex 450 |
. . . . . 6
   CovMap     
 
 ↾t          |
| 71 | 70 | ssrdv 3609 |
. . . . 5
   CovMap     
 
↾t         |
| 72 | 71 | ssdifssd 3748 |
. . . 4
   CovMap     
    
 ↾t         |
| 73 | | uniopn 20702 |
. . . 4
  
↾t      
     ↾t              ↾t         |
| 74 | 57, 72, 73 | syl2anc 693 |
. . 3
   CovMap     
       ↾t         |
| 75 | | eqid 2622 |
. . . 4
  ↾t         ↾t        |
| 76 | 75 | opncld 20837 |
. . 3
  
↾t      
      ↾t          
↾t                 ↾t          |
| 77 | 57, 74, 76 | syl2anc 693 |
. 2
   CovMap     
   
↾t                 ↾t          |
| 78 | 52, 77 | eqeltrrd 2702 |
1
   CovMap     
     ↾t          |