| Step | Hyp | Ref
| Expression |
| 1 | | usgredg2v.v |
. . . . 5
Vtx   |
| 2 | | usgredg2v.e |
. . . . 5
iEdg   |
| 3 | | usgredg2v.a |
. . . . 5
       |
| 4 | 1, 2, 3 | usgredg2vlem1 26117 |
. . . 4
  USGraph
             |
| 5 | 4 | ralrimiva 2966 |
. . 3
 USGraph              |
| 6 | 5 | adantr 481 |
. 2
  USGraph
 
            |
| 7 | 2 | usgrf1 26067 |
. . . . . . . . 9
 USGraph       |
| 8 | 7 | adantr 481 |
. . . . . . . 8
  USGraph
       |
| 9 | | elrabi 3359 |
. . . . . . . . . 10
 
       |
| 10 | 9, 3 | eleq2s 2719 |
. . . . . . . . 9
   |
| 11 | | elrabi 3359 |
. . . . . . . . . 10
 
       |
| 12 | 11, 3 | eleq2s 2719 |
. . . . . . . . 9
   |
| 13 | 10, 12 | anim12i 590 |
. . . . . . . 8
 
     |
| 14 | | f1fveq 6519 |
. . . . . . . 8
     
               |
| 15 | 8, 13, 14 | syl2an 494 |
. . . . . . 7
   USGraph  
 
        
   |
| 16 | 15 | bicomd 213 |
. . . . . 6
   USGraph  
 

           |
| 17 | 16 | notbid 308 |
. . . . 5
   USGraph  
 

           |
| 18 | | simpl 473 |
. . . . . . . . . 10
  USGraph
 USGraph  |
| 19 | | simpl 473 |
. . . . . . . . . 10
 
   |
| 20 | 18, 19 | anim12i 590 |
. . . . . . . . 9
   USGraph  
 
 USGraph    |
| 21 | | preq1 4268 |
. . . . . . . . . . 11
         |
| 22 | 21 | eqeq2d 2632 |
. . . . . . . . . 10
        
          |
| 23 | 22 | cbvriotav 6622 |
. . . . . . . . 9
           
         |
| 24 | 1, 2, 3 | usgredg2vlem2 26118 |
. . . . . . . . 9
  USGraph
                            
             |
| 25 | 20, 23, 24 | mpisyl 21 |
. . . . . . . 8
   USGraph  
 
                   |
| 26 | | simpr 477 |
. . . . . . . . . 10
 
   |
| 27 | 18, 26 | anim12i 590 |
. . . . . . . . 9
   USGraph  
 
 USGraph    |
| 28 | 21 | eqeq2d 2632 |
. . . . . . . . . 10
        
          |
| 29 | 28 | cbvriotav 6622 |
. . . . . . . . 9
           
         |
| 30 | 1, 2, 3 | usgredg2vlem2 26118 |
. . . . . . . . 9
  USGraph
                            
             |
| 31 | 27, 29, 30 | mpisyl 21 |
. . . . . . . 8
   USGraph  
 
                   |
| 32 | 25, 31 | eqeq12d 2637 |
. . . . . . 7
   USGraph  
 
        
                             |
| 33 | 32 | notbid 308 |
. . . . . 6
   USGraph  
 
        
  
                          |
| 34 | | riotaex 6615 |
. . . . . . . . . . . 12
           |
| 35 | 34 | a1i 11 |
. . . . . . . . . . 11
             |
| 36 | | id 22 |
. . . . . . . . . . 11
   |
| 37 | | riotaex 6615 |
. . . . . . . . . . . 12
           |
| 38 | 37 | a1i 11 |
. . . . . . . . . . 11
             |
| 39 | | preq12bg 4386 |
. . . . . . . . . . 11
            
           
 
                          
                     
           
               |
| 40 | 35, 36, 38, 36, 39 | syl22anc 1327 |
. . . . . . . . . 10
                                                                             |
| 41 | 40 | notbid 308 |
. . . . . . . . 9
                                         
       
           
               |
| 42 | 41 | adantl 482 |
. . . . . . . 8
  USGraph
                                         
       
           
               |
| 43 | | ioran 511 |
. . . . . . . . . . 11
              
       
           
               
                 
             
            |
| 44 | | ianor 509 |
. . . . . . . . . . . . 13
                      
                        |
| 45 | 23, 29 | eqeq12i 2636 |
. . . . . . . . . . . . . . . . 17
  
                 
           
          |
| 46 | 45 | notbii 310 |
. . . . . . . . . . . . . . . 16
                    
                      |
| 47 | 46 | biimpi 206 |
. . . . . . . . . . . . . . 15
                                           |
| 48 | 47 | a1d 25 |
. . . . . . . . . . . . . 14
                      USGraph                        |
| 49 | | eqid 2622 |
. . . . . . . . . . . . . . 15
 |
| 50 | 49 | pm2.24i 146 |
. . . . . . . . . . . . . 14
  USGraph                        |
| 51 | 48, 50 | jaoi 394 |
. . . . . . . . . . . . 13
                     
  USGraph                        |
| 52 | 44, 51 | sylbi 207 |
. . . . . . . . . . . 12
                       
USGraph                        |
| 53 | 52 | adantr 481 |
. . . . . . . . . . 11
              
       
             
         
 USGraph
           
           |
| 54 | 43, 53 | sylbi 207 |
. . . . . . . . . 10
              
       
           
             USGraph                        |
| 55 | 54 | com12 32 |
. . . . . . . . 9
 USGraph                                               
                       |
| 56 | 55 | adantr 481 |
. . . . . . . 8
  USGraph
               
       
           
           
           
           |
| 57 | 42, 56 | sylbid 230 |
. . . . . . 7
  USGraph
                                                   |
| 58 | 57 | adantr 481 |
. . . . . 6
   USGraph  
 
                                                  |
| 59 | 33, 58 | sylbid 230 |
. . . . 5
   USGraph  
 
                                |
| 60 | 17, 59 | sylbid 230 |
. . . 4
   USGraph  
 

                       |
| 61 | 60 | con4d 114 |
. . 3
   USGraph  
 
                        |
| 62 | 61 | ralrimivva 2971 |
. 2
  USGraph
 

                        |
| 63 | | usgredg2v.f |
. . 3
             |
| 64 | | fveq2 6191 |
. . . . 5
           |
| 65 | 64 | eqeq1d 2624 |
. . . 4
        
          |
| 66 | 65 | riotabidv 6613 |
. . 3
                       |
| 67 | 63, 66 | f1mpt 6518 |
. 2
    
 
          

                         |
| 68 | 6, 62, 67 | sylanbrc 698 |
1
  USGraph
       |