| Step | Hyp | Ref
 | Expression | 
| 1 |   | df-frec 6449 | 
. . . . . . . . . . . . 13
  frec          recs                                                         
                      | 
| 2 |   | frecsuclem.g | 
. . . . . . . . . . . . . . 15
                 
     
                                                       | 
| 3 |   | recseq 6364 | 
. . . . . . . . . . . . . . 15
                                                               
                 
recs      recs                           
                                                | 
| 4 | 2, 3 | ax-mp 5 | 
. . . . . . . . . . . . . 14
  recs      recs                           
                                               | 
| 5 | 4 | reseq1i 4942 | 
. . . . . . . . . . . . 13
   recs            recs                                                         
                      | 
| 6 | 1, 5 | eqtr4i 2220 | 
. . . . . . . . . . . 12
  frec          recs         | 
| 7 | 6 | fveq1i 5559 | 
. . . . . . . . . . 11
   frec        
       recs              | 
| 8 |   | peano2 4631 | 
. . . . . . . . . . . 12
                    | 
| 9 |   | fvres 5582 | 
. . . . . . . . . . . 12
               recs                 recs          | 
| 10 | 8, 9 | syl 14 | 
. . . . . . . . . . 11
             recs                 recs          | 
| 11 | 7, 10 | eqtrid 2241 | 
. . . . . . . . . 10
            frec        
      recs     
    | 
| 12 | 11 | 3ad2ant3 1022 | 
. . . . . . . . 9
                            
            frec        
      recs     
    | 
| 13 |   | eqid 2196 | 
. . . . . . . . . . 11
  recs      recs    | 
| 14 | 2 | funmpt2 5297 | 
. . . . . . . . . . . 12
      | 
| 15 | 14 | a1i 9 | 
. . . . . . . . . . 11
                            
                | 
| 16 |   | ordom 4643 | 
. . . . . . . . . . . 12
      | 
| 17 | 16 | a1i 9 | 
. . . . . . . . . . 11
                            
                | 
| 18 |   | vex 2766 | 
. . . . . . . . . . . . . 14
        | 
| 19 | 18 | a1i 9 | 
. . . . . . . . . . . . 13
                         
       
                       
       | 
| 20 |   | simp2 1000 | 
. . . . . . . . . . . . . 14
                         
       
                       
       | 
| 21 |   | simp3 1001 | 
. . . . . . . . . . . . . 14
                         
       
                       
       | 
| 22 |   | simp11 1029 | 
. . . . . . . . . . . . . . 15
                         
       
                       
      
           | 
| 23 |   | fveq2 5558 | 
. . . . . . . . . . . . . . . . 17
                          | 
| 24 | 23 | eleq1d 2265 | 
. . . . . . . . . . . . . . . 16
                       
            | 
| 25 | 24 | cbvralv 2729 | 
. . . . . . . . . . . . . . 15
       
           
                    | 
| 26 | 22, 25 | sylib 122 | 
. . . . . . . . . . . . . 14
                         
       
                       
      
           | 
| 27 |   | simp12 1030 | 
. . . . . . . . . . . . . 14
                         
       
                       
       | 
| 28 | 20, 21, 26, 27 | frecabcl 6457 | 
. . . . . . . . . . . . 13
                         
       
                       
                                               
                    | 
| 29 |   | dmeq 4866 | 
. . . . . . . . . . . . . . . . . . 19
                
     | 
| 30 | 29 | eqeq1d 2205 | 
. . . . . . . . . . . . . . . . . 18
               
                    | 
| 31 |   | fveq1 5557 | 
. . . . . . . . . . . . . . . . . . . 20
                          | 
| 32 | 31 | fveq2d 5562 | 
. . . . . . . . . . . . . . . . . . 19
                                  | 
| 33 | 32 | eleq2d 2266 | 
. . . . . . . . . . . . . . . . . 18
                           
                | 
| 34 | 30, 33 | anbi12d 473 | 
. . . . . . . . . . . . . . . . 17
              
                          
      
         
             | 
| 35 | 34 | rexbidv 2498 | 
. . . . . . . . . . . . . . . 16
              
                                                                       | 
| 36 | 29 | eqeq1d 2205 | 
. . . . . . . . . . . . . . . . 17
               
     
          | 
| 37 | 36 | anbi1d 465 | 
. . . . . . . . . . . . . . . 16
              
                                     | 
| 38 | 35, 37 | orbi12d 794 | 
. . . . . . . . . . . . . . 15
                                                      
               
     
      
                                              | 
| 39 | 38 | abbidv 2314 | 
. . . . . . . . . . . . . 14
                                                          
                                                                
                | 
| 40 | 39, 2 | fvmptg 5637 | 
. . . . . . . . . . . . 13
                             
                                                                                                           
                | 
| 41 | 19, 28, 40 | syl2anc 411 | 
. . . . . . . . . . . 12
                         
       
                       
                         
                                              | 
| 42 | 41, 28 | eqeltrd 2273 | 
. . . . . . . . . . 11
                         
       
                       
           | 
| 43 |   | limom 4650 | 
. . . . . . . . . . . . . . 15
      | 
| 44 |   | limuni 4431 | 
. . . . . . . . . . . . . . 15
          
      | 
| 45 | 43, 44 | ax-mp 5 | 
. . . . . . . . . . . . . 14
         | 
| 46 | 45 | eleq2i 2263 | 
. . . . . . . . . . . . 13
          
        | 
| 47 |   | peano2 4631 | 
. . . . . . . . . . . . 13
                
   | 
| 48 | 46, 47 | sylbir 135 | 
. . . . . . . . . . . 12
                     | 
| 49 | 48 | adantl 277 | 
. . . . . . . . . . 11
                         
       
              
           | 
| 50 | 45 | eleq2i 2263 | 
. . . . . . . . . . . . 13
            
          | 
| 51 | 8, 50 | sylib 122 | 
. . . . . . . . . . . 12
                     | 
| 52 | 51 | 3ad2ant3 1022 | 
. . . . . . . . . . 11
                            
                     | 
| 53 | 13, 15, 17, 42, 49, 52 | tfrcldm 6421 | 
. . . . . . . . . 10
                            
                  
recs     | 
| 54 | 13 | tfr2a 6379 | 
. . . . . . . . . 10
           recs       recs               recs     
       | 
| 55 | 53, 54 | syl 14 | 
. . . . . . . . 9
                            
            recs               recs     
       | 
| 56 | 12, 55 | eqtrd 2229 | 
. . . . . . . 8
                            
            frec        
         recs             | 
| 57 |   | tfrfun 6378 | 
. . . . . . . . . . 11
    recs    | 
| 58 | 57 | a1i 9 | 
. . . . . . . . . 10
                            
             recs     | 
| 59 | 8 | 3ad2ant3 1022 | 
. . . . . . . . . 10
                            
                    | 
| 60 |   | resfunexg 5783 | 
. . . . . . . . . 10
      recs                  recs                | 
| 61 | 58, 59, 60 | syl2anc 411 | 
. . . . . . . . 9
                            
            recs                | 
| 62 |   | frecfcl 6463 | 
. . . . . . . . . . . . 13
                                frec            | 
| 63 | 6 | feq1i 5400 | 
. . . . . . . . . . . . 13
   frec            
 recs              | 
| 64 | 62, 63 | sylib 122 | 
. . . . . . . . . . . 12
                                 recs              | 
| 65 | 64 | 3adant3 1019 | 
. . . . . . . . . . 11
                            
            recs              | 
| 66 |   | simp3 1001 | 
. . . . . . . . . . . 12
                            
                  | 
| 67 |   | ordelsuc 4541 | 
. . . . . . . . . . . . . 14
                       
   
          | 
| 68 | 16, 67 | mpan2 425 | 
. . . . . . . . . . . . 13
               
   
          | 
| 69 | 68 | 3ad2ant3 1022 | 
. . . . . . . . . . . 12
                            
               
   
          | 
| 70 | 66, 69 | mpbid 147 | 
. . . . . . . . . . 11
                            
                    | 
| 71 |   | fssres2 5435 | 
. . . . . . . . . . 11
     recs                         
 recs                  | 
| 72 | 65, 70, 71 | syl2anc 411 | 
. . . . . . . . . 10
                            
            recs                  | 
| 73 |   | simp1 999 | 
. . . . . . . . . . 11
                            
                 
           | 
| 74 | 73, 25 | sylib 122 | 
. . . . . . . . . 10
                            
                 
           | 
| 75 |   | simp2 1000 | 
. . . . . . . . . 10
                            
                  | 
| 76 | 59, 72, 74, 75 | frecabcl 6457 | 
. . . . . . . . 9
                            
                            recs                    
       recs                      recs                               | 
| 77 |   | dmeq 4866 | 
. . . . . . . . . . . . . . 15
        recs     
        
       recs            | 
| 78 | 77 | eqeq1d 2205 | 
. . . . . . . . . . . . . 14
        recs     
                   
   recs                   | 
| 79 |   | fveq1 5557 | 
. . . . . . . . . . . . . . . 16
        recs     
                 recs               | 
| 80 | 79 | fveq2d 5562 | 
. . . . . . . . . . . . . . 15
        recs     
                        recs                | 
| 81 | 80 | eleq2d 2266 | 
. . . . . . . . . . . . . 14
        recs     
                         
       recs                 | 
| 82 | 78, 81 | anbi12d 473 | 
. . . . . . . . . . . . 13
        recs     
                      
                 
 recs                    
       recs                  | 
| 83 | 82 | rexbidv 2498 | 
. . . . . . . . . . . 12
        recs     
                                            
           recs                    
       recs                  | 
| 84 | 77 | eqeq1d 2205 | 
. . . . . . . . . . . . 13
        recs     
                     recs     
           | 
| 85 | 84 | anbi1d 465 | 
. . . . . . . . . . . 12
        recs     
                           
    recs                          | 
| 86 | 83, 85 | orbi12d 794 | 
. . . . . . . . . . 11
        recs     
                    
                                             
     
      recs                            recs                      recs                           | 
| 87 | 86 | abbidv 2314 | 
. . . . . . . . . 10
        recs     
                                                      
                                  recs                    
       recs                      recs                           | 
| 88 | 87, 2 | fvmptg 5637 | 
. . . . . . . . 9
     recs                
                 recs                    
       recs                      recs                                     recs                               recs                            recs                      recs                           | 
| 89 | 61, 76, 88 | syl2anc 411 | 
. . . . . . . 8
                            
               recs                               recs                            recs                      recs                           | 
| 90 | 56, 89 | eqtrd 2229 | 
. . . . . . 7
                            
            frec        
                      recs     
                
     recs     
                recs                           | 
| 91 | 90 | abeq2d 2309 | 
. . . . . 6
                            
                 frec        
                 recs     
                
     recs     
                recs                           | 
| 92 |   | fdm 5413 | 
. . . . . . . . . . . 12
    recs                  
   recs                  | 
| 93 | 72, 92 | syl 14 | 
. . . . . . . . . . 11
                            
              recs                  | 
| 94 |   | peano3 4632 | 
. . . . . . . . . . . 12
                    | 
| 95 | 94 | 3ad2ant3 1022 | 
. . . . . . . . . . 11
                            
                    | 
| 96 | 93, 95 | eqnetrd 2391 | 
. . . . . . . . . 10
                            
              recs                | 
| 97 | 96 | neneqd 2388 | 
. . . . . . . . 9
                            
                recs                | 
| 98 | 97 | intnanrd 933 | 
. . . . . . . 8
                            
                 recs     
        
          | 
| 99 |   | biorf 745 | 
. . . . . . . 8
         recs                             
        recs     
                
     recs     
                 recs                                     recs                    
       recs                   | 
| 100 | 98, 99 | syl 14 | 
. . . . . . 7
                            
              
        recs     
                
     recs     
                 recs                                     recs                    
       recs                   | 
| 101 |   | orcom 729 | 
. . . . . . 7
        recs                              
      recs                            recs                               recs                    
       recs                      recs                          | 
| 102 | 100, 101 | bitrdi 196 | 
. . . . . 6
                            
              
        recs     
                
     recs     
                        recs                    
       recs                      recs                           | 
| 103 | 93 | eqeq1d 2205 | 
. . . . . . . . . 10
                            
               recs                  
            | 
| 104 |   | vex 2766 | 
. . . . . . . . . . . 12
        | 
| 105 |   | suc11g 4593 | 
. . . . . . . . . . . 12
               
                 
        | 
| 106 | 104, 105 | mpan2 425 | 
. . . . . . . . . . 11
                                | 
| 107 | 106 | 3ad2ant3 1022 | 
. . . . . . . . . 10
                            
                                | 
| 108 | 103, 107 | bitrd 188 | 
. . . . . . . . 9
                            
               recs                  
        | 
| 109 |   | eqcom 2198 | 
. . . . . . . . 9
          
       | 
| 110 | 108, 109 | bitrdi 196 | 
. . . . . . . 8
                            
               recs                  
        | 
| 111 | 110 | anbi1d 465 | 
. . . . . . 7
                            
              
 recs                    
       recs                 
      
           recs                  | 
| 112 | 111 | rexbidv 2498 | 
. . . . . 6
                            
              
        recs     
                
     recs     
                     
       
       recs                  | 
| 113 | 91, 102, 112 | 3bitr2d 216 | 
. . . . 5
                            
                 frec        
                        
     recs     
            | 
| 114 |   | fveq2 5558 | 
. . . . . . . 8
             recs                  recs               | 
| 115 | 114 | fveq2d 5562 | 
. . . . . . 7
                recs                      recs                | 
| 116 | 115 | eleq2d 2266 | 
. . . . . 6
                     recs                  
       recs                 | 
| 117 | 116 | ceqsrexbv 2895 | 
. . . . 5
                      
     recs     
                    
         recs                 | 
| 118 | 113, 117 | bitrdi 196 | 
. . . 4
                            
                 frec        
                 
     recs     
            | 
| 119 | 118 | 3anibar 1167 | 
. . 3
                            
                 frec        
              recs                 | 
| 120 | 119 | eqrdv 2194 | 
. 2
                            
            frec        
          recs                | 
| 121 |   | sucidg 4451 | 
. . . . . 6
                    | 
| 122 |   | fvres 5582 | 
. . . . . 6
               recs     
           recs        | 
| 123 | 121, 122 | syl 14 | 
. . . . 5
             recs                 recs        | 
| 124 | 6 | fveq1i 5559 | 
. . . . . 6
   frec              recs     
      | 
| 125 |   | fvres 5582 | 
. . . . . 6
             recs               recs        | 
| 126 | 124, 125 | eqtrid 2241 | 
. . . . 5
            frec             recs        | 
| 127 | 123, 126 | eqtr4d 2232 | 
. . . 4
             recs                 frec           | 
| 128 | 127 | 3ad2ant3 1022 | 
. . 3
                            
             recs                 frec           | 
| 129 | 128 | fveq2d 5562 | 
. 2
                            
                recs                     frec            | 
| 130 | 120, 129 | eqtrd 2229 | 
1
                            
            frec        
         frec            |