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Theorem nfa1-o 2118
Description:  x is not free in  A. x ph. (Contributed by Mario Carneiro, 11-Aug-2016.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
nfa1-o  |-  F/ x A. x ph

Proof of Theorem nfa1-o
StepHypRef Expression
1 hba1-o 2101 . 2  |-  ( A. x ph  ->  A. x A. x ph )
21nfi 1541 1  |-  F/ x A. x ph
Colors of variables: wff set class
Syntax hints:   A.wal 1530   F/wnf 1534
This theorem is referenced by:  ax10-16  2142  ax11eq  2145  ax11el  2146  ax11v2-o  2153
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-4 2087  ax-5o 2088  ax-6o 2089
This theorem depends on definitions:  df-bi 177  df-nf 1535
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