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Theorem nfab 2286
Description: Bound-variable hypothesis builder for a class abstraction. (Contributed by Mario Carneiro, 11-Aug-2016.)
Hypothesis
Ref Expression
nfab.1 𝑥𝜑
Assertion
Ref Expression
nfab 𝑥{𝑦𝜑}

Proof of Theorem nfab
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 nfab.1 . . 3 𝑥𝜑
21nfsab 2131 . 2 𝑥 𝑧 ∈ {𝑦𝜑}
32nfci 2271 1 𝑥{𝑦𝜑}
Colors of variables: wff set class
Syntax hints:  wnf 1436  {cab 2125  wnfc 2268
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515
This theorem depends on definitions:  df-bi 116  df-nf 1437  df-sb 1736  df-clab 2126  df-nfc 2270
This theorem is referenced by:  nfaba1  2287  nfrabxy  2611  sbcel12g  3017  sbceqg  3018  nfun  3232  nfpw  3523  nfpr  3573  nfop  3721  nfuni  3742  nfint  3781  intab  3800  nfiunxy  3839  nfiinxy  3840  nfiunya  3841  nfiinya  3842  nfiu1  3843  nfii1  3844  nfopab  3996  nfopab1  3997  nfopab2  3998  repizf2  4086  nfdm  4783  fun11iun  5388  eusvobj2  5760  nfoprab1  5820  nfoprab2  5821  nfoprab3  5822  nfoprab  5823  nfrecs  6204  nffrec  6293  nfixpxy  6611  nfixp1  6612
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