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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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