| Step | Hyp | Ref
| Expression |
| 1 | | 3an6 1262 |
. . 3
   Nn Nn  Nn Nn     1 
    1
      Nn Nn    1 
 

Nn Nn    1
      |
| 2 | | eeanv 1913 |
. . . 4
       1 
  1        1 
    1
     |
| 3 | 2 | 3anbi3i 1144 |
. . 3
   Nn Nn  Nn Nn       1 
  1
      Nn Nn  Nn Nn     1 
    1
      |
| 4 | | df-sfin 4447 |
. . . 4
Sfin     Nn Nn    1 
    |
| 5 | | df-sfin 4447 |
. . . 4
Sfin     Nn Nn    1
     |
| 6 | 4, 5 | anbi12i 678 |
. . 3
 Sfin
   Sfin       Nn Nn    1 
 

Nn Nn    1
      |
| 7 | 1, 3, 6 | 3bitr4ri 269 |
. 2
 Sfin
   Sfin       Nn Nn  Nn Nn       1 
  1
      |
| 8 | | simpllr 735 |
. . . . . . 7
    Nn Nn  Nn Nn    1 
  1     Nn  |
| 9 | | simprll 738 |
. . . . . . 7
    Nn Nn  Nn Nn    1 
  1     1   |
| 10 | | simprrl 740 |
. . . . . . 7
    Nn Nn  Nn Nn    1 
  1     1
  |
| 11 | | ncfinlower 4484 |
. . . . . . 7
  Nn 1 1   Nn 
   |
| 12 | 8, 9, 10, 11 | syl3anc 1182 |
. . . . . 6
    Nn Nn  Nn Nn    1 
  1      Nn 
   |
| 13 | | nnpweq 4524 |
. . . . . . . . . 10
  Nn
  Nn   
   |
| 14 | 13 | 3expb 1152 |
. . . . . . . . 9
  Nn    
Nn       |
| 15 | | simp1rl 1020 |
. . . . . . . . . . . . . 14
    Nn Nn  Nn Nn    1 
  1    
Nn  
    Nn  |
| 16 | | simp3l 983 |
. . . . . . . . . . . . . 14
    Nn Nn  Nn Nn    1 
  1    
Nn  
    Nn  |
| 17 | | simp2lr 1023 |
. . . . . . . . . . . . . 14
    Nn Nn  Nn Nn    1 
  1    
Nn  
       |
| 18 | | simp3rl 1028 |
. . . . . . . . . . . . . 14
    Nn Nn  Nn Nn    1 
  1    
Nn  
       |
| 19 | | nnceleq 4431 |
. . . . . . . . . . . . . 14
   Nn Nn   
 
  |
| 20 | 15, 16, 17, 18, 19 | syl22anc 1183 |
. . . . . . . . . . . . 13
    Nn Nn  Nn Nn    1 
  1    
Nn  
      |
| 21 | | simp1rr 1021 |
. . . . . . . . . . . . . 14
    Nn Nn  Nn Nn    1 
  1    
Nn  
    Nn  |
| 22 | | simp2rr 1025 |
. . . . . . . . . . . . . 14
    Nn Nn  Nn Nn    1 
  1    
Nn  
       |
| 23 | | simp3rr 1029 |
. . . . . . . . . . . . . 14
    Nn Nn  Nn Nn    1 
  1    
Nn  
       |
| 24 | | nnceleq 4431 |
. . . . . . . . . . . . . 14
   Nn Nn   
 
  |
| 25 | 21, 16, 22, 23, 24 | syl22anc 1183 |
. . . . . . . . . . . . 13
    Nn Nn  Nn Nn    1 
  1    
Nn  
      |
| 26 | 20, 25 | eqtr4d 2388 |
. . . . . . . . . . . 12
    Nn Nn  Nn Nn    1 
  1    
Nn  
      |
| 27 | 26 | 3expa 1151 |
. . . . . . . . . . 11
     Nn Nn  Nn Nn    1 
  1      Nn  
      |
| 28 | 27 | expr 598 |
. . . . . . . . . 10
     Nn Nn  Nn Nn    1 
  1    
Nn         |
| 29 | 28 | rexlimdva 2739 |
. . . . . . . . 9
    Nn Nn  Nn Nn    1 
  1       Nn   
    |
| 30 | 14, 29 | syl5 28 |
. . . . . . . 8
    Nn Nn  Nn Nn    1 
  1       Nn 
     |
| 31 | 30 | exp3a 425 |
. . . . . . 7
    Nn Nn  Nn Nn    1 
  1      Nn        |
| 32 | 31 | rexlimdv 2738 |
. . . . . 6
    Nn Nn  Nn Nn    1 
  1       Nn      |
| 33 | 12, 32 | mpd 14 |
. . . . 5
    Nn Nn  Nn Nn    1 
  1       |
| 34 | 33 | ex 423 |
. . . 4
   Nn Nn  Nn Nn     1 
  1   
   |
| 35 | 34 | exlimdvv 1637 |
. . 3
   Nn Nn  Nn Nn         1 
  1   
   |
| 36 | 35 | 3impia 1148 |
. 2
   Nn Nn  Nn Nn       1 
  1
      |
| 37 | 7, 36 | sylbi 187 |
1
 Sfin
   Sfin       |