| Step | Hyp | Ref
| Expression |
| 1 | | 3anan32 1013 |
. . 3
  ♯        ..^                 
                         ♯                             
 ..^                     |
| 2 | 1 | a1i 9 |
. 2
  USPGraph

Walks 
Walks   ♯         ♯        ..^                                        
 
♯                               ..^                      |
| 3 | | wlkeq 16065 |
. . . 4
  Walks  Walks 
♯         ♯      
 ..^                                            |
| 4 | 3 | 3expa 1227 |
. . 3
   Walks  Walks  
♯         ♯      
 ..^                                            |
| 5 | 4 | 3adant1 1039 |
. 2
  USPGraph

Walks 
Walks   ♯         ♯      
 ..^                                            |
| 6 | | fzofzp1 10433 |
. . . . . . . . . . . 12
  ..^
        |
| 7 | 6 | adantl 277 |
. . . . . . . . . . 11
    USPGraph  Walks  Walks  
♯      
♯        ..^ 
        |
| 8 | | fveq2 5627 |
. . . . . . . . . . . . 13
                       |
| 9 | | fveq2 5627 |
. . . . . . . . . . . . 13
                       |
| 10 | 8, 9 | eqeq12d 2244 |
. . . . . . . . . . . 12
                                           |
| 11 | 10 | adantl 277 |
. . . . . . . . . . 11
     USPGraph  Walks 
Walks  
♯       ♯        ..^    
                                        |
| 12 | 7, 11 | rspcdv 2910 |
. . . . . . . . . 10
    USPGraph  Walks  Walks  
♯      
♯        ..^ 
 
                    
       
               |
| 13 | 12 | impancom 260 |
. . . . . . . . 9
    USPGraph  Walks  Walks  
♯      
♯                                ..^                        |
| 14 | 13 | ralrimiv 2602 |
. . . . . . . 8
    USPGraph  Walks  Walks  
♯      
♯                                ..^                        |
| 15 | | fvoveq1 6024 |
. . . . . . . . . 10
                       |
| 16 | | fvoveq1 6024 |
. . . . . . . . . 10
                       |
| 17 | 15, 16 | eqeq12d 2244 |
. . . . . . . . 9
                                             |
| 18 | 17 | cbvralvw 2769 |
. . . . . . . 8
 
 ..^                      
 ..^                        |
| 19 | 14, 18 | sylibr 134 |
. . . . . . 7
    USPGraph  Walks  Walks  
♯      
♯                                ..^                        |
| 20 | | fzossfz 10362 |
. . . . . . . . . 10
 ..^      |
| 21 | | ssralv 3288 |
. . . . . . . . . 10
  ..^    
 
                    
  ..^                     |
| 22 | 20, 21 | mp1i 10 |
. . . . . . . . 9
   USPGraph 
Walks 
Walks   ♯      
♯      
 
                    
  ..^                     |
| 23 | | r19.26 2657 |
. . . . . . . . . . 11
 
 ..^                  
                        ..^                 
  ..^                         |
| 24 | | preq12 3745 |
. . . . . . . . . . . . 13
                 
                    
                                            |
| 25 | 24 | a1i 9 |
. . . . . . . . . . . 12
   USPGraph 
Walks 
Walks   ♯      
♯      
                 
                    
                                             |
| 26 | 25 | ralimdv 2598 |
. . . . . . . . . . 11
   USPGraph 
Walks 
Walks   ♯      
♯      
 
 ..^                  
                    
  ..^                                               |
| 27 | 23, 26 | biimtrrid 153 |
. . . . . . . . . 10
   USPGraph 
Walks 
Walks   ♯      
♯      
  
 ..^                 
  ..^                         ..^                                               |
| 28 | 27 | expd 258 |
. . . . . . . . 9
   USPGraph 
Walks 
Walks   ♯      
♯      
 
 ..^                     ..^                     
  ..^                                                |
| 29 | 22, 28 | syld 45 |
. . . . . . . 8
   USPGraph 
Walks 
Walks   ♯      
♯      
 
                    
 
 ..^                        ..^                                                |
| 30 | 29 | imp 124 |
. . . . . . 7
    USPGraph  Walks  Walks  
♯      
♯                                 ..^                     
  ..^                                               |
| 31 | 19, 30 | mpd 13 |
. . . . . 6
    USPGraph  Walks  Walks  
♯      
♯                                ..^                                              |
| 32 | 31 | ex 115 |
. . . . 5
   USPGraph 
Walks 
Walks   ♯      
♯      
 
                    
  ..^                                               |
| 33 | | uspgrupgr 15979 |
. . . . . . . 8
 USPGraph UPGraph |
| 34 | | eqid 2229 |
. . . . . . . . . 10
Vtx  Vtx   |
| 35 | | eqid 2229 |
. . . . . . . . . 10
iEdg  iEdg   |
| 36 | | eqid 2229 |
. . . . . . . . . 10
         |
| 37 | | eqid 2229 |
. . . . . . . . . 10
         |
| 38 | 34, 35, 36, 37 | upgrwlkcompim 16073 |
. . . . . . . . 9
  UPGraph
Walks  
     Word iEdg           ♯         Vtx 
  ..^ ♯         iEdg                                     |
| 39 | 38 | ex 115 |
. . . . . . . 8
 UPGraph  Walks       Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                      |
| 40 | 33, 39 | syl 14 |
. . . . . . 7
 USPGraph  Walks       Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                      |
| 41 | | eqid 2229 |
. . . . . . . . . 10
         |
| 42 | | eqid 2229 |
. . . . . . . . . 10
         |
| 43 | 34, 35, 41, 42 | upgrwlkcompim 16073 |
. . . . . . . . 9
  UPGraph
Walks  
     Word iEdg           ♯         Vtx 
  ..^ ♯         iEdg                                     |
| 44 | 43 | ex 115 |
. . . . . . . 8
 UPGraph  Walks       Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                      |
| 45 | 33, 44 | syl 14 |
. . . . . . 7
 USPGraph  Walks       Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                      |
| 46 | | oveq2 6009 |
. . . . . . . . . . . . . . . . . . 19
 ♯       ..^ ♯        ..^   |
| 47 | 46 | eqcoms 2232 |
. . . . . . . . . . . . . . . . . 18
 ♯       ..^ ♯        ..^   |
| 48 | 47 | raleqdv 2734 |
. . . . . . . . . . . . . . . . 17
 ♯         ..^ ♯         iEdg                                 
  ..^   iEdg                                     |
| 49 | | oveq2 6009 |
. . . . . . . . . . . . . . . . . . 19
 ♯       ..^ ♯        ..^   |
| 50 | 49 | eqcoms 2232 |
. . . . . . . . . . . . . . . . . 18
 ♯       ..^ ♯        ..^   |
| 51 | 50 | raleqdv 2734 |
. . . . . . . . . . . . . . . . 17
 ♯         ..^ ♯         iEdg                                 
  ..^   iEdg                                     |
| 52 | 48, 51 | bi2anan9r 609 |
. . . . . . . . . . . . . . . 16
  ♯      ♯           ..^ ♯         iEdg                                  
 ..^ ♯         iEdg                                      ..^   iEdg                                    ..^   iEdg                                      |
| 53 | | r19.26 2657 |
. . . . . . . . . . . . . . . . 17
 
 ..^    iEdg                                   iEdg                                  
 
 ..^   iEdg                                  
 ..^   iEdg                                     |
| 54 | | eqeq2 2239 |
. . . . . . . . . . . . . . . . . . . . 21
                                             iEdg                                   iEdg                                     |
| 55 | | eqeq2 2239 |
. . . . . . . . . . . . . . . . . . . . . . 23
                       iEdg            
  iEdg                                 
 iEdg              iEdg                |
| 56 | 55 | eqcoms 2232 |
. . . . . . . . . . . . . . . . . . . . . 22
  iEdg                                    iEdg                                   iEdg              iEdg                |
| 57 | 56 | biimpd 144 |
. . . . . . . . . . . . . . . . . . . . 21
  iEdg                                    iEdg                                   iEdg              iEdg                |
| 58 | 54, 57 | biimtrdi 163 |
. . . . . . . . . . . . . . . . . . . 20
                                             iEdg                                    iEdg                                   iEdg              iEdg                 |
| 59 | 58 | com13 80 |
. . . . . . . . . . . . . . . . . . 19
  iEdg                                    iEdg                                                                              iEdg              iEdg                 |
| 60 | 59 | imp 124 |
. . . . . . . . . . . . . . . . . 18
   iEdg                                   iEdg                                                                               iEdg              iEdg                |
| 61 | 60 | ral2imi 2595 |
. . . . . . . . . . . . . . . . 17
 
 ..^    iEdg                                   iEdg                                      ..^                                           
  ..^   iEdg              iEdg                |
| 62 | 53, 61 | sylbir 135 |
. . . . . . . . . . . . . . . 16
    ..^   iEdg                                  
 ..^   iEdg                                      ..^                                           
  ..^   iEdg              iEdg                |
| 63 | 52, 62 | biimtrdi 163 |
. . . . . . . . . . . . . . 15
  ♯      ♯           ..^ ♯         iEdg                                  
 ..^ ♯         iEdg                                  
 
 ..^                                              ..^   iEdg              iEdg                 |
| 64 | 63 | com12 30 |
. . . . . . . . . . . . . 14
    ..^ ♯         iEdg                                  
 ..^ ♯         iEdg                                  
 
♯      ♯          ..^                                           
  ..^   iEdg              iEdg                 |
| 65 | 64 | ex 115 |
. . . . . . . . . . . . 13
 
 ..^ ♯         iEdg                                     ..^ ♯         iEdg                                    ♯      ♯          ..^                                           
  ..^   iEdg              iEdg                  |
| 66 | 65 | 3ad2ant3 1044 |
. . . . . . . . . . . 12
      Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                  
 
 ..^ ♯         iEdg                                    ♯      ♯          ..^                                           
  ..^   iEdg              iEdg                  |
| 67 | 66 | com12 30 |
. . . . . . . . . . 11
 
 ..^ ♯         iEdg                                        Word
iEdg 
         ♯         Vtx 
  ..^ ♯         iEdg                                     ♯     
♯      
 
 ..^                                              ..^   iEdg              iEdg                  |
| 68 | 67 | 3ad2ant3 1044 |
. . . . . . . . . 10
      Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                  
      Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                  
 
♯      ♯          ..^                                           
  ..^   iEdg              iEdg                  |
| 69 | 68 | imp 124 |
. . . . . . . . 9
       Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                        Word
iEdg 
         ♯         Vtx 
  ..^ ♯         iEdg                                      ♯      ♯          ..^                                           
  ..^   iEdg              iEdg                 |
| 70 | 69 | expd 258 |
. . . . . . . 8
       Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                        Word
iEdg 
         ♯         Vtx 
  ..^ ♯         iEdg                                     ♯       ♯       
 ..^                                              ..^   iEdg              iEdg                  |
| 71 | 70 | a1i 9 |
. . . . . . 7
 USPGraph        Word
iEdg           ♯         Vtx    ..^ ♯         iEdg                                        Word
iEdg 
         ♯         Vtx 
  ..^ ♯         iEdg                                     ♯       ♯       
 ..^                                              ..^   iEdg              iEdg                   |
| 72 | 40, 45, 71 | syl2and 295 |
. . . . . 6
 USPGraph   Walks 
Walks    ♯       ♯       
 ..^                                              ..^   iEdg              iEdg                   |
| 73 | 72 | 3imp1 1244 |
. . . . 5
   USPGraph 
Walks 
Walks   ♯      
♯      
 
 ..^                                              ..^   iEdg              iEdg                |
| 74 | | eqcom 2231 |
. . . . . . 7
  iEdg              iEdg              iEdg              iEdg               |
| 75 | 35 | uspgrf1oedg 15974 |
. . . . . . . . . . . 12
 USPGraph iEdg    iEdg    Edg    |
| 76 | | f1of1 5571 |
. . . . . . . . . . . 12
 iEdg    iEdg    Edg  iEdg    iEdg    Edg    |
| 77 | 75, 76 | syl 14 |
. . . . . . . . . . 11
 USPGraph iEdg    iEdg    Edg    |
| 78 | | eqidd 2230 |
. . . . . . . . . . . 12
 USPGraph iEdg  iEdg    |
| 79 | | eqidd 2230 |
. . . . . . . . . . . 12
 USPGraph
iEdg  iEdg    |
| 80 | | edgvalg 15860 |
. . . . . . . . . . . . 13
 USPGraph Edg  iEdg    |
| 81 | 80 | eqcomd 2235 |
. . . . . . . . . . . 12
 USPGraph
iEdg  Edg    |
| 82 | 78, 79, 81 | f1eq123d 5564 |
. . . . . . . . . . 11
 USPGraph  iEdg    iEdg    iEdg 
iEdg    iEdg    Edg     |
| 83 | 77, 82 | mpbird 167 |
. . . . . . . . . 10
 USPGraph iEdg    iEdg    iEdg    |
| 84 | 83 | 3ad2ant1 1042 |
. . . . . . . . 9
  USPGraph

Walks 
Walks   ♯       iEdg    iEdg    iEdg    |
| 85 | 84 | adantr 276 |
. . . . . . . 8
   USPGraph 
Walks 
Walks   ♯      
♯      
iEdg    iEdg    iEdg    |
| 86 | 34, 35, 36, 37 | wlkelwrd 16064 |
. . . . . . . . . . . . . . 15
 Walks 
     Word iEdg           ♯         Vtx     |
| 87 | 34, 35, 41, 42 | wlkelwrd 16064 |
. . . . . . . . . . . . . . 15
 Walks 
     Word iEdg           ♯         Vtx     |
| 88 | | oveq2 6009 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
 ♯       ..^  ..^ ♯         |
| 89 | 88 | eleq2d 2299 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
 ♯        ..^  ..^ ♯          |
| 90 | | wrdsymbcl 11085 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
      Word
iEdg   ..^ ♯                iEdg    |
| 91 | 90 | expcom 116 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
  ..^ ♯            Word
iEdg          iEdg     |
| 92 | 89, 91 | biimtrdi 163 |
. . . . . . . . . . . . . . . . . . . . . . . . 25
 ♯        ..^      Word iEdg          iEdg      |
| 93 | 92 | adantr 276 |
. . . . . . . . . . . . . . . . . . . . . . . 24
  ♯      ♯         ..^      Word
iEdg          iEdg      |
| 94 | 93 | imp 124 |
. . . . . . . . . . . . . . . . . . . . . . 23
   ♯      ♯        ..^       Word iEdg          iEdg     |
| 95 | 94 | com12 30 |
. . . . . . . . . . . . . . . . . . . . . 22
     Word
iEdg 
   ♯      ♯        ..^          iEdg     |
| 96 | 95 | adantl 277 |
. . . . . . . . . . . . . . . . . . . . 21
      Word
iEdg      Word iEdg  
   ♯      ♯        ..^          iEdg     |
| 97 | | oveq2 6009 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
 ♯       ..^  ..^ ♯         |
| 98 | 97 | eleq2d 2299 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
 ♯        ..^  ..^ ♯          |
| 99 | | wrdsymbcl 11085 |
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
      Word
iEdg   ..^ ♯                iEdg    |
| 100 | 99 | expcom 116 |
. . . . . . . . . . . . . . . . . . . . . . . . . 26
  ..^ ♯            Word
iEdg          iEdg     |
| 101 | 98, 100 | biimtrdi 163 |
. . . . . . . . . . . . . . . . . . . . . . . . 25
 ♯        ..^      Word iEdg          iEdg      |
| 102 | 101 | adantl 277 |
. . . . . . . . . . . . . . . . . . . . . . . 24
  ♯      ♯         ..^      Word
iEdg          iEdg      |
| 103 | 102 | imp 124 |
. . . . . . . . . . . . . . . . . . . . . . 23
   ♯      ♯        ..^       Word iEdg          iEdg     |
| 104 | 103 | com12 30 |
. . . . . . . . . . . . . . . . . . . . . 22
     Word
iEdg 
   ♯      ♯        ..^          iEdg     |
| 105 | 104 | adantr 276 |
. . . . . . . . . . . . . . . . . . . . 21
      Word
iEdg      Word iEdg  
   ♯      ♯        ..^          iEdg     |
| 106 | 96, 105 | jcad 307 |
. . . . . . . . . . . . . . . . . . . 20
      Word
iEdg      Word iEdg  
   ♯      ♯        ..^           iEdg          iEdg      |
| 107 | 106 | ex 115 |
. . . . . . . . . . . . . . . . . . 19
     Word
iEdg 
     Word iEdg     ♯      ♯      
 ..^           iEdg          iEdg       |
| 108 | 107 | adantr 276 |
. . . . . . . . . . . . . . . . . 18
      Word
iEdg           ♯         Vtx        Word iEdg     ♯      ♯      
 ..^           iEdg          iEdg       |
| 109 | 108 | com12 30 |
. . . . . . . . . . . . . . . . 17
     Word
iEdg 
      Word
iEdg           ♯         Vtx      ♯      ♯      
 ..^           iEdg          iEdg       |
| 110 | 109 | adantr 276 |
. . . . . . . . . . . . . . . 16
      Word
iEdg           ♯         Vtx         Word
iEdg 
         ♯         Vtx      ♯     
♯        ..^ 
         iEdg 
        iEdg       |
| 111 | 110 | imp 124 |
. . . . . . . . . . . . . . 15
       Word
iEdg           ♯         Vtx        Word iEdg           ♯         Vtx       ♯     
♯        ..^ 
         iEdg 
        iEdg      |
| 112 | 86, 87, 111 | syl2an 289 |
. . . . . . . . . . . . . 14
  Walks  Walks  
   ♯      ♯        ..^           iEdg          iEdg      |
| 113 | 112 | expd 258 |
. . . . . . . . . . . . 13
  Walks  Walks  
 
♯      ♯         ..^          iEdg          iEdg       |
| 114 | 113 | expd 258 |
. . . . . . . . . . . 12
  Walks  Walks  
 ♯       ♯        ..^          iEdg 
        iEdg        |
| 115 | 114 | imp 124 |
. . . . . . . . . . 11
   Walks  Walks  
♯        ♯        ..^          iEdg 
        iEdg       |
| 116 | 115 | 3adant1 1039 |
. . . . . . . . . 10
  USPGraph

Walks 
Walks   ♯        ♯        ..^          iEdg 
        iEdg       |
| 117 | 116 | imp 124 |
. . . . . . . . 9
   USPGraph 
Walks 
Walks   ♯      
♯      
  ..^          iEdg          iEdg      |
| 118 | 117 | imp 124 |
. . . . . . . 8
    USPGraph  Walks  Walks  
♯      
♯        ..^ 
         iEdg 
        iEdg     |
| 119 | | f1veqaeq 5893 |
. . . . . . . 8
  iEdg    iEdg    iEdg 
         iEdg 
        iEdg   
  iEdg              iEdg            
                   |
| 120 | 85, 118, 119 | syl2an2r 597 |
. . . . . . 7
    USPGraph  Walks  Walks  
♯      
♯        ..^ 
  iEdg              iEdg            
                   |
| 121 | 74, 120 | biimtrid 152 |
. . . . . 6
    USPGraph  Walks  Walks  
♯      
♯        ..^ 
  iEdg              iEdg            
                   |
| 122 | 121 | ralimdva 2597 |
. . . . 5
   USPGraph 
Walks 
Walks   ♯      
♯      
 
 ..^   iEdg              iEdg            
  ..^                     |
| 123 | 32, 73, 122 | 3syld 57 |
. . . 4
   USPGraph 
Walks 
Walks   ♯      
♯      
 
                    
  ..^                     |
| 124 | 123 | expimpd 363 |
. . 3
  USPGraph

Walks 
Walks   ♯         ♯                               ..^                     |
| 125 | 124 | pm4.71d 393 |
. 2
  USPGraph

Walks 
Walks   ♯         ♯                            
 
♯                               ..^                      |
| 126 | 2, 5, 125 | 3bitr4d 220 |
1
  USPGraph

Walks 
Walks   ♯         ♯      
                         |