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Theorem nfaba1 2424
Description: Bound-variable hypothesis builder for a class abstraction. (Contributed by Mario Carneiro, 14-Oct-2016.)
Assertion
Ref Expression
nfaba1  |-  F/_ x { y  |  A. x ph }

Proof of Theorem nfaba1
StepHypRef Expression
1 nfa1 1756 . 2  |-  F/ x A. x ph
21nfab 2423 1  |-  F/_ x { y  |  A. x ph }
Colors of variables: wff set class
Syntax hints:   A.wal 1527   {cab 2269   F/_wnfc 2406
This theorem is referenced by:  nfopd  3813  nfimad  5021  nfiota1  5221  nffvd  5534
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866
This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-clab 2270  df-nfc 2408
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