Metamath Proof Explorer
Description: Bound-variable hypothesis builder for function value. (Contributed by NM, 14-Nov-1995) (Revised by Mario Carneiro, 15-Oct-2016)
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|
Ref |
Expression |
|
Hypotheses |
nffv.1 |
|
|
|
nffv.2 |
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|
Assertion |
nffv |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
nffv.1 |
|
2 |
|
nffv.2 |
|
3 |
|
df-fv |
|
4 |
|
nfcv |
|
5 |
2 1 4
|
nfbr |
|
6 |
5
|
nfiotaw |
|
7 |
3 6
|
nfcxfr |
|