| Step | Hyp | Ref
| Expression |
| 1 | | eqid 2622 |
. . . 4
       |
| 2 | 1 | mpt2fun 6762 |
. . 3
    |
| 3 | 2 | a1i 11 |
. 2
      |
| 4 | | gsum2d2.u |
. . 3
   |
| 5 | | gsum2d2.f |
. . . . . 6
 

 
  |
| 6 | 5 | ralrimivva 2971 |
. . . . 5
  
  |
| 7 | 1 | fmpt2x 7236 |
. . . . 5
 

              |
| 8 | 6, 7 | sylib 208 |
. . . 4
  
   
        |
| 9 | | relxp 5227 |
. . . . . . . 8
     |
| 10 | 9 | rgenw 2924 |
. . . . . . 7

     |
| 11 | | reliun 5239 |
. . . . . . 7
 
   

      |
| 12 | 10, 11 | mpbir 221 |
. . . . . 6

     |
| 13 | | eldifi 3732 |
. . . . . . 7
  
   
 
      |
| 14 | 13 | adantl 482 |
. . . . . 6
 
               |
| 15 | | elrel 5222 |
. . . . . 6
                     |
| 16 | 12, 14, 15 | sylancr 695 |
. . . . 5
 
          
     |
| 17 | | nfv 1843 |
. . . . . . 7
   |
| 18 | | nfiu1 4550 |
. . . . . . . . 9
  
     |
| 19 | | nfcv 2764 |
. . . . . . . . 9
   |
| 20 | 18, 19 | nfdif 3731 |
. . . . . . . 8
          |
| 21 | 20 | nfcri 2758 |
. . . . . . 7
  
      |
| 22 | 17, 21 | nfan 1828 |
. . . . . 6
            |
| 23 | | nfmpt21 6722 |
. . . . . . . 8
   
  |
| 24 | | nfcv 2764 |
. . . . . . . 8
   |
| 25 | 23, 24 | nffv 6198 |
. . . . . . 7
          |
| 26 | 25 | nfeq1 2778 |
. . . . . 6
          |
| 27 | | nfv 1843 |
. . . . . . 7
            |
| 28 | | nfmpt22 6723 |
. . . . . . . . 9
   
  |
| 29 | | nfcv 2764 |
. . . . . . . . 9
   |
| 30 | 28, 29 | nffv 6198 |
. . . . . . . 8
          |
| 31 | 30 | nfeq1 2778 |
. . . . . . 7
          |
| 32 | | simprr 796 |
. . . . . . . . . 10
 
       
          |
| 33 | 32 | fveq2d 6195 |
. . . . . . . . 9
 
       
              
         |
| 34 | | df-ov 6653 |
. . . . . . . . . 10
   
              |
| 35 | | simprl 794 |
. . . . . . . . . . . . . . 15
 
       
      
       |
| 36 | 32, 35 | eqeltrrd 2702 |
. . . . . . . . . . . . . 14
 
       
                 |
| 37 | 36 | eldifad 3586 |
. . . . . . . . . . . . 13
 
       
               |
| 38 | | opeliunxp 5170 |
. . . . . . . . . . . . 13
        

   |
| 39 | 37, 38 | sylib 208 |
. . . . . . . . . . . 12
 
       
     
   |
| 40 | 39 | simpld 475 |
. . . . . . . . . . 11
 
       
       |
| 41 | 39 | simprd 479 |
. . . . . . . . . . 11
 
       
       |
| 42 | 39, 5 | syldan 487 |
. . . . . . . . . . 11
 
       
    
  |
| 43 | 1 | ovmpt4g 6783 |
. . . . . . . . . . 11
 
          |
| 44 | 40, 41, 42, 43 | syl3anc 1326 |
. . . . . . . . . 10
 
       
              |
| 45 | 34, 44 | syl5eqr 2670 |
. . . . . . . . 9
 
       
                 |
| 46 | | eldifn 3733 |
. . . . . . . . . . . . 13
  
   
   |
| 47 | 46 | ad2antrl 764 |
. . . . . . . . . . . 12
 
       
    
  |
| 48 | 32 | eleq1d 2686 |
. . . . . . . . . . . . 13
 
       
            |
| 49 | | df-br 4654 |
. . . . . . . . . . . . 13
  
  
  |
| 50 | 48, 49 | syl6bbr 278 |
. . . . . . . . . . . 12
 
       
           |
| 51 | 47, 50 | mtbid 314 |
. . . . . . . . . . 11
 
       
         |
| 52 | 39, 51 | jca 554 |
. . . . . . . . . 10
 
       
             |
| 53 | | gsum2d2.n |
. . . . . . . . . 10
 
 
      |
| 54 | 52, 53 | syldan 487 |
. . . . . . . . 9
 
       
    
 |
| 55 | 33, 45, 54 | 3eqtrd 2660 |
. . . . . . . 8
 
       
             |
| 56 | 55 | expr 643 |
. . . . . . 7
 
              
      |
| 57 | 27, 31, 56 | exlimd 2087 |
. . . . . 6
 
         
            |
| 58 | 22, 26, 57 | exlimd 2087 |
. . . . 5
 
                        |
| 59 | 16, 58 | mpd 15 |
. . . 4
 
          
     |
| 60 | 8, 59 | suppss 7325 |
. . 3
     supp   |
| 61 | | ssfi 8180 |
. . 3
      supp      supp
  |
| 62 | 4, 60, 61 | syl2anc 693 |
. 2
     supp
  |
| 63 | | gsum2d2.a |
. . . 4
   |
| 64 | | gsum2d2.r |
. . . . 5
 
   |
| 65 | 64 | ralrimiva 2966 |
. . . 4
 
  |
| 66 | 1 | mpt2exxg 7244 |
. . . 4
         |
| 67 | 63, 65, 66 | syl2anc 693 |
. . 3
  
   |
| 68 | | gsum2d2.z |
. . . . 5
     |
| 69 | | fvex 6201 |
. . . . 5
     |
| 70 | 68, 69 | eqeltri 2697 |
. . . 4
 |
| 71 | 70 | a1i 11 |
. . 3
   |
| 72 | | isfsupp 8279 |
. . 3
   
      finSupp   
   
 supp     |
| 73 | 67, 71, 72 | syl2anc 693 |
. 2
     finSupp   
   
 supp     |
| 74 | 3, 62, 73 | mpbir2and 957 |
1
  
 finSupp  |