Metamath Proof Explorer
Description: Implicit substitution of a class for a setvar variable. (Contributed by Mario Carneiro, 15-Oct-2016)
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Ref |
Expression |
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Hypotheses |
vtocld.1 |
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vtocld.2 |
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vtocld.3 |
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Assertion |
vtocld |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
vtocld.1 |
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2 |
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vtocld.2 |
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3 |
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vtocld.3 |
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4 |
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nfv |
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5 |
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nfcvd |
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6 |
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nfvd |
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7 |
1 2 3 4 5 6
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vtocldf |
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