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Mirrors > Home > ILE Home > Th. List > vex | Unicode version |
Description: All setvar variables are sets (see isset 2732). Theorem 6.8 of [Quine] p. 43. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
vex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | equid 1689 | . 2 | |
2 | df-v 2728 | . . 3 | |
3 | 2 | abeq2i 2277 | . 2 |
4 | 1, 3 | mpbir 145 | 1 |
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