| Step | Hyp | Ref
| Expression |
| 1 | | tgpgrp 21882 |
. . . . 5
   |
| 2 | | eqid 2622 |
. . . . . 6
         |
| 3 | | tgphaus.1 |
. . . . . 6
     |
| 4 | 2, 3 | grpidcl 17450 |
. . . . 5
       |
| 5 | 1, 4 | syl 17 |
. . . 4

      |
| 6 | | tgphaus.j |
. . . . . 6
     |
| 7 | 6, 2 | tgptopon 21886 |
. . . . 5
 TopOn        |
| 8 | | toponuni 20719 |
. . . . 5
 TopOn             |
| 9 | 7, 8 | syl 17 |
. . . 4
        |
| 10 | 5, 9 | eleqtrd 2703 |
. . 3

   |
| 11 | | eqid 2622 |
. . . . 5
   |
| 12 | 11 | sncld 21175 |
. . . 4
          |
| 13 | 12 | expcom 451 |
. . 3
 
       |
| 14 | 10, 13 | syl 17 |
. 2
         |
| 15 | | eqid 2622 |
. . . . . 6
         |
| 16 | 6, 15 | tgpsubcn 21894 |
. . . . 5
           |
| 17 | | cnclima 21072 |
. . . . . 6
              
                 |
| 18 | 17 | ex 450 |
. . . . 5
        
                       |
| 19 | 16, 18 | syl 17 |
. . . 4
     
                  |
| 20 | | cnvimass 5485 |
. . . . . . . . 9
        
     |
| 21 | 2, 15 | grpsubf 17494 |
. . . . . . . . . . 11
                         |
| 22 | 1, 21 | syl 17 |
. . . . . . . . . 10
                         |
| 23 | | fdm 6051 |
. . . . . . . . . 10
                      
                |
| 24 | 22, 23 | syl 17 |
. . . . . . . . 9

                |
| 25 | 20, 24 | syl5sseq 3653 |
. . . . . . . 8
        
             |
| 26 | | relxp 5227 |
. . . . . . . 8
           |
| 27 | | relss 5206 |
. . . . . . . 8
         
                                 |
| 28 | 25, 26, 27 | mpisyl 21 |
. . . . . . 7

           |
| 29 | | dfrel4v 5584 |
. . . . . . 7
         
                           |
| 30 | 28, 29 | sylib 208 |
. . . . . 6
        
                   |
| 31 | | ffn 6045 |
. . . . . . . . . . . 12
                      
                |
| 32 | 22, 31 | syl 17 |
. . . . . . . . . . 11
                 |
| 33 | | elpreima 6337 |
. . . . . . . . . . 11
                          
                              |
| 34 | 32, 33 | syl 17 |
. . . . . . . . . 10
                                           |
| 35 | | opelxp 5146 |
. . . . . . . . . . . 12
             
    
       |
| 36 | 35 | anbi1i 731 |
. . . . . . . . . . 11
                          
                     
   |
| 37 | 2, 3, 15 | grpsubeq0 17501 |
. . . . . . . . . . . . . . 15
 
                 
   |
| 38 | 37 | 3expb 1266 |
. . . . . . . . . . . . . 14
  
   
              
   |
| 39 | 1, 38 | sylan 488 |
. . . . . . . . . . . . 13
                         |
| 40 | | df-ov 6653 |
. . . . . . . . . . . . . . 15
                    |
| 41 | 40 | eleq1i 2692 |
. . . . . . . . . . . . . 14
        
             |
| 42 | | ovex 6678 |
. . . . . . . . . . . . . . 15
         |
| 43 | 42 | elsn 4192 |
. . . . . . . . . . . . . 14
        
         |
| 44 | 41, 43 | bitr3i 266 |
. . . . . . . . . . . . 13
                     |
| 45 | | equcom 1945 |
. . . . . . . . . . . . 13

  |
| 46 | 39, 44, 45 | 3bitr4g 303 |
. . . . . . . . . . . 12
                        
   |
| 47 | 46 | pm5.32da 673 |
. . . . . . . . . . 11
                       
      
    
    |
| 48 | 36, 47 | syl5bb 272 |
. . . . . . . . . 10
                           
               |
| 49 | 34, 48 | bitrd 268 |
. . . . . . . . 9
                   
    
    |
| 50 | | df-br 4654 |
. . . . . . . . 9
           
  
           |
| 51 | | eleq1 2689 |
. . . . . . . . . . . 12
     
       |
| 52 | 51 | biimparc 504 |
. . . . . . . . . . 11
             |
| 53 | 52 | pm4.71i 664 |
. . . . . . . . . 10
      
              |
| 54 | | an32 839 |
. . . . . . . . . 10
      
           
        |
| 55 | 53, 54 | bitr4i 267 |
. . . . . . . . 9
      
              |
| 56 | 49, 50, 55 | 3bitr4g 303 |
. . . . . . . 8
            
    
    |
| 57 | 56 | opabbidv 4716 |
. . . . . . 7
                              |
| 58 | | opabresid 5455 |
. . . . . . 7
          
      |
| 59 | 57, 58 | syl6eq 2672 |
. . . . . 6
                        |
| 60 | 9 | reseq2d 5396 |
. . . . . 6
          |
| 61 | 30, 59, 60 | 3eqtrd 2660 |
. . . . 5
        
     |
| 62 | 61 | eleq1d 2686 |
. . . 4
                
           |
| 63 | 19, 62 | sylibd 229 |
. . 3
     
           |
| 64 | | topontop 20718 |
. . . . 5
 TopOn        |
| 65 | 7, 64 | syl 17 |
. . . 4
   |
| 66 | 11 | hausdiag 21448 |
. . . . 5


           |
| 67 | 66 | baib 944 |
. . . 4
 
           |
| 68 | 65, 67 | syl 17 |
. . 3
             |
| 69 | 63, 68 | sylibrd 249 |
. 2
     
   |
| 70 | 14, 69 | impbid 202 |
1
         |