| New Foundations Explorer | 
      
      
      < Previous  
      Next >
      
       Nearby theorems  | 
  ||
| Mirrors > Home > NFE Home > Th. List > df-rex | Unicode version | ||
| Description: Define restricted existential quantification. Special case of Definition 4.15(4) of [TakeutiZaring] p. 22. (Contributed by NM, 30-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| df-rex | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | wph | 
. . 3
 | |
| 2 | vx | 
. . 3
 | |
| 3 | cA | 
. . 3
 | |
| 4 | 1, 2, 3 | wrex 2616 | 
. 2
 | 
| 5 | 2 | cv 1641 | 
. . . . 5
 | 
| 6 | 5, 3 | wcel 1710 | 
. . . 4
 | 
| 7 | 6, 1 | wa 358 | 
. . 3
 | 
| 8 | 7, 2 | wex 1541 | 
. 2
 | 
| 9 | 4, 8 | wb 176 | 
1
 | 
| Copyright terms: Public domain | W3C validator |