| Step | Hyp | Ref
| Expression |
| 1 | | nbgrel.v |
. . . 4
Vtx   |
| 2 | | nbgrel.e |
. . . 4
Edg   |
| 3 | 1, 2 | nbgrval 26234 |
. . 3
  NeighbVtx       
      |
| 4 | 3 | adantl 482 |
. 2
  UMGraph
  NeighbVtx       
      |
| 5 | | eldifi 3732 |
. . . . . . . . . 10
    
  |
| 6 | 5 | adantl 482 |
. . . . . . . . 9
   UMGraph      
  |
| 7 | 6 | adantr 481 |
. . . . . . . 8
    UMGraph


            |
| 8 | | umgrupgr 25998 |
. . . . . . . . . . . . 13
 UMGraph UPGraph  |
| 9 | 8 | ad4antr 768 |
. . . . . . . . . . . 12
     UMGraph 

   
    
UPGraph  |
| 10 | | simpr 477 |
. . . . . . . . . . . . 13
    UMGraph


   
   |
| 11 | 10 | adantr 481 |
. . . . . . . . . . . 12
     UMGraph 

   
       |
| 12 | | simpr 477 |
. . . . . . . . . . . 12
     UMGraph 

   
          |
| 13 | | simpr 477 |
. . . . . . . . . . . . . . . 16
  UMGraph
   |
| 14 | 13 | adantr 481 |
. . . . . . . . . . . . . . 15
   UMGraph      
  |
| 15 | | vex 3203 |
. . . . . . . . . . . . . . . 16
 |
| 16 | 15 | a1i 11 |
. . . . . . . . . . . . . . 15
   UMGraph      
  |
| 17 | | eldifsn 4317 |
. . . . . . . . . . . . . . . . 17
    

   |
| 18 | | simpr 477 |
. . . . . . . . . . . . . . . . . 18
     |
| 19 | 18 | necomd 2849 |
. . . . . . . . . . . . . . . . 17
     |
| 20 | 17, 19 | sylbi 207 |
. . . . . . . . . . . . . . . 16
       |
| 21 | 20 | adantl 482 |
. . . . . . . . . . . . . . 15
   UMGraph         |
| 22 | 14, 16, 21 | 3jca 1242 |
. . . . . . . . . . . . . 14
   UMGraph       
   |
| 23 | 22 | adantr 481 |
. . . . . . . . . . . . 13
    UMGraph


   
 
   |
| 24 | 23 | adantr 481 |
. . . . . . . . . . . 12
     UMGraph 

   
     
   |
| 25 | 1, 2 | upgredgpr 26037 |
. . . . . . . . . . . 12
   UPGraph
   

       |
| 26 | 9, 11, 12, 24, 25 | syl31anc 1329 |
. . . . . . . . . . 11
     UMGraph 

   
          |
| 27 | 26 | ex 450 |
. . . . . . . . . 10
    UMGraph


   
    
      |
| 28 | | eleq1 2689 |
. . . . . . . . . . 11
   
   
   |
| 29 | 28 | biimprd 238 |
. . . . . . . . . 10
   
       |
| 30 | 27, 10, 29 | syl6ci 71 |
. . . . . . . . 9
    UMGraph


   
    
      |
| 31 | 30 | impr 649 |
. . . . . . . 8
    UMGraph


            
  |
| 32 | 7, 31 | jca 554 |
. . . . . . 7
    UMGraph


                 |
| 33 | 32 | rexlimdvaa 3032 |
. . . . . 6
   UMGraph           
   
    |
| 34 | 33 | expimpd 629 |
. . . . 5
  UMGraph
       
 
          |
| 35 | | simprl 794 |
. . . . . . . 8
   UMGraph       
  |
| 36 | 2 | umgredgne 26040 |
. . . . . . . . . 10
  UMGraph
   
  |
| 37 | 36 | ad2ant2rl 785 |
. . . . . . . . 9
   UMGraph          |
| 38 | 37 | necomd 2849 |
. . . . . . . 8
   UMGraph          |
| 39 | 35, 38, 17 | sylanbrc 698 |
. . . . . . 7
   UMGraph       
      |
| 40 | | simpr 477 |
. . . . . . . . 9
           |
| 41 | 40 | adantl 482 |
. . . . . . . 8
   UMGraph             |
| 42 | | sseq2 3627 |
. . . . . . . . 9
   
             |
| 43 | 42 | adantl 482 |
. . . . . . . 8
    UMGraph


                      |
| 44 | | ssid 3624 |
. . . . . . . . 9
       |
| 45 | 44 | a1i 11 |
. . . . . . . 8
   UMGraph                |
| 46 | 41, 43, 45 | rspcedvd 3317 |
. . . . . . 7
   UMGraph        
     |
| 47 | 39, 46 | jca 554 |
. . . . . 6
   UMGraph             
 
    |
| 48 | 47 | ex 450 |
. . . . 5
  UMGraph
     
      
 
     |
| 49 | 34, 48 | impbid 202 |
. . . 4
  UMGraph
       
 
 

       |
| 50 | | preq2 4269 |
. . . . . . 7
         |
| 51 | 50 | sseq1d 3632 |
. . . . . 6
    
      |
| 52 | 51 | rexbidv 3052 |
. . . . 5
  
  

      |
| 53 | 52 | elrab 3363 |
. . . 4
      
 
 
     
 
    |
| 54 | | preq2 4269 |
. . . . . 6
     
   |
| 55 | 54 | eleq1d 2686 |
. . . . 5
    
  
   |
| 56 | 55 | elrab 3363 |
. . . 4
         
   |
| 57 | 49, 53, 56 | 3bitr4g 303 |
. . 3
  UMGraph
           
        |
| 58 | 57 | eqrdv 2620 |
. 2
  UMGraph
           
  
   |
| 59 | 4, 58 | eqtrd 2656 |
1
  UMGraph
  NeighbVtx         |