Theorem nfa2 1602

Description: Lemma 24 of [Monk2] p. 114. (Contributed by Mario Carneiro, 24-Sep-2016.)

Assertion

Ref	Expression
nfa2	|- F/ x A. y A. x ph

Proof of Theorem nfa2

Step	Hyp	Ref	Expression
1		nfa1 1564	. 2 |- F/ x A. x ph
2	1	nfal 1599	1 |- F/ x A. y A. x ph

Syntax hints:   A.wal 1371   F/wnf 1483

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ial 1557

This theorem depends on definitions:  df-bi 117  df-nf 1484

This theorem is referenced by:  cbv1h  1769  csbie2t  3142  copsex2t  4289  fnoprabg  6046