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| Description: All setvar variables are sets (see isset 2769). Theorem 6.8 of [Quine] p. 43. (Contributed by NM, 5-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| vex | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | equid 1715 | 
. 2
 | |
| 2 | df-v 2765 | 
. . 3
 | |
| 3 | 2 | abeq2i 2307 | 
. 2
 | 
| 4 | 1, 3 | mpbir 146 | 
1
 | 
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