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Description: All setvar variables are sets (see isset 2743). Theorem 6.8 of [Quine] p. 43. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
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vex |
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Step | Hyp | Ref | Expression |
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1 | equid 1701 |
. 2
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2 | df-v 2739 |
. . 3
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3 | 2 | abeq2i 2288 |
. 2
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4 | 1, 3 | mpbir 146 |
1
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