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Theorem nfof 5769
Description: Hypothesis builder for function operation. (Contributed by Mario Carneiro, 20-Jul-2014.)
Hypothesis
Ref Expression
nfof.1 𝑥𝑅
Assertion
Ref Expression
nfof 𝑥𝑓 𝑅
Distinct variable group:   𝑥,𝑅

Proof of Theorem nfof
StepHypRef Expression
1 nfcv 2223 1 𝑥𝑓 𝑅
Colors of variables: wff set class
Syntax hints:  wnfc 2210  𝑓 cof 5762
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-gen 1379  ax-17 1460
This theorem depends on definitions:  df-bi 115  df-nf 1391  df-nfc 2212
This theorem is referenced by: (None)
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